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Atlassian Stash - Send notifications to a Slack channel when a repo push occurs
Datadog - Send notifications to slack when alerts trigger, and share graphs with your colleagues in chat.
Drupal - Send messages from a Drupal website to Slack
Graylog2 - Send log alerts to Slack
Slack Message Builder - A tool for previewing how JSON payloads translate to Slack messages
Slack Slash Commands as a Service - Useful tools and API integrations through slash commands.
Slacker - Post funny replies to Slack as your favourite character
Wordpress Plugin: Caldera Forms Slack Integration - Get notifications in Slack whenever a Caldera Form is submitted
Wordpress Plugin: Slack - Send notifications to Slack when events occur in WordPress
Wordpress Plugin: bbPress Slack - Send notifications of new bbPress topics and replies to Slack

Themes

Slackthemes - A Slack sidebar theme browser
Sweet Themes are Made of These - site for sharing Slack custom palettes

Integrations

C

PebbleSlack - A Slack app for Pebble

C++

slack-integrations - Custom Slack integration scripts

C#

Cake.Slack - Cake AddIn that extends Cake with Slack messaging features
CCNetSlackPublisher - Slack integration with CruiseControl.NET
Log4Slack - simple, asynchronous Slack log4net appender
margiebot - A .NET library designed to make building bots for Slack fast, easy, and fun
mmbot - a C# port of hubot, with Slack support
Slack-Contour - Umbraco Contour workflow item that allows you to post the form data to a Slack channel
Slack.Webhooks - Even simpler integration with Slack's Incoming / Outgoing webhooks
SlackAPI - Full Slack API library, including WebSockets
SlackCommander - Useful (?) slash commands and miscellaneous integrations for Slack
SqlServerSlackAPI - A SQL Server CLR assembly for direct communication with Slack via TSQL
svn-slack-notifier - A simple app to send VisualSVN Server commit notifications to Slack
TfsNotificationRelay - A plugin for TFS 2013 that sends notifications to Slack
TSJ.Gemini.Slack - Posts issue changes to a channel in Slack
WooCode.Slack - Library for slacking with Slack.com in .Net
workfront-to-slack - Checks for updates from a workfront team and pushes them to a Slack channel

Clojure

clj-slack - Use Slack REST API from Clojure
clj-slack-client - A Clojure client for the Slack RTM and Web APIs
lunch-bot - A Slack bot that manages group lunch activities
markov-chainz - A Markov chain bot written in Clojure
slack-hooks - Papertrail's collection of webhook receivers for Slack
slack.clj - Example of sending a message to Slack from Clojure
slacks - Deliver quotes to a Slack channel

CoffeeScript

bugsnag-notification-plugins - Notification plugins for Bugsnag error tracker
gifmatic - Search Giphy and send a matching image back to Slack
hubot-basecamp - Expands Basecamp URLs in chat with more useful information
humors - Custom Hubot
jinora - Slack webhook app to create anonymous public channels
pr2slack - Non-spammy pull request messages
slack-api-client - A Slack API client for node.js
slack-node-sdk - Slack Node SDK with Webhook and API support
slacker - Meteor-based API for Slack commands

Dart

dart-slack - Dart interface to the Webhook API

Erlang

slacker - Erlang Slack REST API wrapper

Go

amiando-slack - Push Amiando ticket sales to Slack
anonymous-slack - A service you can run on Heroku to send anonymous messages to colleagues
circle2slack - Proxy CircleCI webhooks to Slack
enotify-slack - A tool to get event information and send it to Slack
gdrive2slack - Frictionless integration between Google Drive and Slack
go-bot - IRC bot written in go
hal - A chat bot in Go
hipchat-notifications-to-slack - forward notifications from HipChat to Slack
marvin - Slack bot written in Go
phoenix - Pluggable bot for Slack
rmslack - Purge a slack channel of all messages
slack - Slack API in Go
slack_auth_proxy - A reverse proxy providing authentication via a slack.com team
slack-cli - A command tool to communicate with Slack
slack-fingerbumpbot - A bot for Slack that never leaves a finger bump hanging
slack-markov - A markov chain bot for your Slack channel
slack-oldbot - A bot for Slack that politely reports when a link has been used before in the channel
slack-upvote - Slack voting integration
slackbot - A silly little slackhq robot
slackbot (II) - Framework for building slash commands for Slack
slackcat - Post messages to Slack from the command line
slacker-news - Slack integration that reports current news items
slackline - Create a Slack channel shared by two organizations
slackline-gae - Google App Engine app to share channels between Slack accounts
SlackMS - SMS your team channel in Slack
slackrus - Slack hook for Logrus
slacktogo - Slack Integration Server for distributing channels between different Slack teams
webhook - Easily run commands in response to HTTP webhook requests from Slack
worktile-events-to-slack - Forward Worktile events to Slack

Groovy

slack-ozfindbiz - Outgoing WebHook Integration to search for Australian businesses and POIs

Haskell

hi5bot - Get and give high-fives on Slack
jpgtobot - jpg.to bot for Slack
slack - A Haskell client for the Slack web API

Java

AcraSlack - Sample project for Android Studio showing how to implement ACRA and Slack integration
gitblit-slack-plugin - Post Gitblit events to a Slack channel
rundeck-slack-incoming-webhook-plugin - A Rundeck Plugin for Slack Incoming WebHooks
rundeck-slack-plugin - A Rundeck Plugin for Slack
simple-slack-api - A Slack client library in Java
SlackMC - Bukkit/Bungee plugin for Slack
slack-client - Displays a Slack unread icon in the system tray
slack-for-confluence - Confluence updates in Slack
slack-webhook - Slack WebHook Integration for Java
stash2slack - Send Stash server events as notifications to Slack
tcSlackBuildNotifier - Post TeamCity build notifications to Slack

JavaScript

bip-pod-slack - Slack Pod for BipIO
bitbucket-slack-pr-hook - Receive Pull Request notifications from BitBucket and send them to Slack
brackets-slacksnippet - push code snippets from Brackets to a slack channel
browser-node-slack - Slack integration for node and browserify
bunyan-slack - Bunyan stream for Slack chat integration
camayak-to-slack - Node.js app that allows Slack to work as a Camayak publishing destination
chivebot - A pluggable Slack bot based on Outgoing Webhooks
CircleCI2Slack - Node app that proxies build notifications from CircleCI to Slack
crispyfi - A local pseudo-bot that controls Spotify through Slack
cylebot-slack - Cylebot, but for Slack
ExceptionalIO2Slack - Send exceptions from Exceptional.io to Slack
generator-slack-command - Yeoman generator to create a simple Slack slash command server
gif-bot - A Gif Bot for Slack
giphyslack - Giphy integration for Slack built in node.js
good-slack - Slack Webhook message posting for Good process monitor
grunt-alert - Sends alerts about failing builds using different channels
grunt-slack-hook - Grunt plugin to send messages to Slack
hublin-slack-integration - Integrate Hubl.in with Slack
imma-let-you-finish - A bot that randomly appears in your conversation to tell everyone who has the best comment of all times
irc-slack-echo - Echoes IRC activity to Slack, and supports IRC/Slack username mapping
Live-WorldCup-Notification-for-Slack - World Cup 2014 notifications
LOUDBOT-SLACK - LOUDBOT FOR SLACK
nasa-slack - a slack integration to post the nasa photo of the day
node-slack-cli - Send messages to Slack from the command line with nodejs
node-slack-irc - Node.js solution to integrate IRC chats to Slack
node-slackbot - Slackbot for node.js using RTM API
node-slackhook - A node module for Slack custom hooks
node-slackr - A node.js library for sending messages to Slack
nodebot-slack - A Node.js bot for Slack teams
Notifications for Fluid - Use native notification center for Slack in fluid.app
Overcast - A SSH-based cloud management CLI with Slack support
passport-slack - Slack OAuth2 strategy for Passport
skynet - A framework for slack bots
Send-to-Slack - A plugin for Sketch.app to share artboards to Slack
slack-alias-plugin - Auto-expand mentions of certain aliases to their respective users
slack-api - a javascript wrapper for the Slack API
slack-assembla-plugin - Watches Slack channels for messages about Assembla and acts accordingly
slack-bill-sharing - Bill sharing bot for Slack
slack-bot-api - Simple way to control your Slack Bot
slack-brewbot - Whose turn is it to make a brew? Let BrewBot decide
slack-btc - Simple node.js REST API to add a BTC ticker to Slack
slack-chat - A support chat feature for your website that integrates with Slack
slack-cli - A command line interface for Slack using node
slack-clicky - Chrome Extension that lets you share links to Slack in a single click
slack-currency - Slash command for converting currency
slack-dnd - D&D slash commands for Slack
slack-emoji-randomizer - replace emoji in your messages with random emoji
slack-github - Post github commits to Slack
slack-harvest - Send a daily Slack message with a list of tracked time from Harvest
slack-integrations - The Collective Digital Studio Slack integration server
slack-integrator - Easily integrate Slack with your apps!
slack-invite - Invite people to your awesome slack group
slack-irc - Connects Slack and IRC channels by sending messages back and forth
slack-irc-plugin - Sync IRC with your Slack account
slack-jira-plugin - Watches Slack channels for messages about JIRA and acts accordingly
slack-meme - Slack meme integration
slack-middle-server - Intermediate webhook server for Slack
slack-movie - slack command for getting movie info
slack-news - Read news from multiple sources within Slack by just typing /news
slack-notify - A Node.js wrapper around the Slack Webhook API
slack-pokemon - A bot for having Pokemon battles in Slack
slack-poker-bot - A bot that deals Texas Hold'em games in Slack
slack-polls - Express.js app for native polling on Slack
slack-pongbot - Slack bot for ping pong tracking
slack-proxy - Simple proxy between AWS SQS queue and Slack
slack-reply-shortcut - Use the "R" shortcut key w/ selected text to easily reply in the web app
slack-stuart - An extendable bot server for Slack
slack-tableflip - A tableflip slash command
slack-texts - Receive SMS notifications in Slack using Twilio
Slack-Twitter - Node.js middleware to create a reading and writing Twitter client out of Slack
slack-webex-plugin - Launch a Webex Personal Room or other type of meeting from Slack
slack-yandex-api - Simple server app for Yandex API and Slack integration
slack.com.js - Google Chrome extension to make emoticons look better
slack-issue-tracker-parser (II) - A Google Chrome extension to turn issues numbers into links to the issue on an issue tracker
slackapi-angularjs - AngularJS module wrapper for the Slack Web API
slackarma - Give your teammates reputation points in Slack
slackbot-says - Chrome extension to post messages to Slack as Slackbot
slackbotapi - node.js Slack RTM API module
slackbox - Spotify playlist collaboration through Slack
SlackChannelTrafficIndicator - Chrome extension that plots the traffic in Slack channels
slackdraw - A Google Chrome extension to draw and share the drawings on Slack
slackey - A JavaScript SDK for the Slack API
slackihook - Send incoming webhooks to Slack with Node.js
slackin - Public Slack organizations made easy
slacklink - Post links to Slack from Chrome
slackr-bot - A node module for making bots that use the Slack RTM API
slacktappd - A tiny little app to post Untappd checkins to Slack
slacktocracy - A tiny little app to post Fitocracy workouts to Slack
SlackToggle - Chrome extension to collapse/expand a Slack discussion section
slackus - New Disqus comment notifier for Slack
SlackVote - Slack integration that allows team members to vote
slackWeather.js - Slack slackbot send weather forecast
slackWeatherBot.js - A world weather bot using the Yahoo Weather API and Node.js
Slotify - Slack plugin that returns top 5 tracks of an artist
SnooBot - Look up information about Reddit subs
spotify-playlist-2-slack - Share updates to a Spotify playlist in Slack
step-slack-notify - Send a message to Slack after a build or deploy
strider-slack - Slack Incoming Webhooks as a Strider-CD plugin
superscript - A dialogue engine for creating chat bots
swolebot - A Slack bot for keeping your team fit through open pull requests
terminal-slack - Terminal client for Slack
tesla-slack - Track your Tesla from Slack

Lua

breezBot - Air quality index bot for Slack using the breezometer API
Lua Slack - A Lua Slack API wrapper
lubot - Lua Chatbot running inside OpenResty
uberSlackBot - Get Uber price estimates directly in Slack

Matlab

SlackMatlab - Basic integration for Slack notifications for Matlab

OCaml

slacko - A neat interface for Slack

Perl

slack-integrations - Scripts to integrate Slack with subversion and nagios
slappyhour - A CGI script to bridge a channel between multiple Slack instances

PHP

AlfredSlackSearch - Alfred.app workflow that searches your team's Slack history
Archibald - A Slack integration to post GIF replies from replygif.net
beanstalk-slack - Integrates your deploy commits from Beanstalk directly into Slack
CLSlackBundle - Symfony bundle that lets you interact with the Slack API and webhooks
ExceptionHandler - PHP Exception Handler to post exceptions to a Slack channel
Gifbot - GIFs for your Slack channel
GifBot - Random GIF generator for your Slack channels
jira-slack-php - JIRA-Slack Integration in PHP
make-it-rain - Animated gif notifications whenever you get paid through Stripe
MantisBT-Slack - MantisBT plugin to send bug updates to Slack
mediawiki-slack - Mediawiki integration for Slack
monolog - Sends your logs to Slack
notifyme - Provides a common interface for notification services
opauth-slack - Slack authentication strategy for Opauth
phlack - PHP API Wrapper
php-slack - A lightweight PHP implementation of Slack's API
PHP-Slack - PHP API Wrapper with Laravel support
php-slack-error-reporter - Library to report errors to slack.
pslackr - Library for sending messages from your app to Slack
redmine-command - Redmine-Slack integration to manage issues
rocketeer-slack - Slack plugin for Rocketeer
Shooker - Slack WebHooks PHP Class
Slack - Laravel 4 package for sending messages to Slack
slack-api - A super simple wrapper for the Slack API
slack-notifier - Simple PHP wrapper for Slack notifications
slack-sdk - PHP SDK
slack-tea - Decide who makes the tea using Slack
slack-webhooks - Easily add service with webhooks integration in Slack
slack-wordpress - Wordpress integration for Slack
SlackAgainstHumanity - A laravel 5 package for playing Cards Against Humanity in your Slack channel
SlackBundle - SlackBundle for Symfony2
slackcamp - Post Basecamp events to Slack
Slacker - Simple Slack client for the CLI
SlackGoogle - Slash command that returns a Google search URL, like LMGTFY
SlackHelper - Object-oriented classes for sending data to Slack via incoming webhooks
SlackHolidayBot - Posts today's holiday to a channel in Slack
slackuntappd - A webhook that allows you to search for beer information within Slack via Untappd
SlackWamp - A WAMP wrapper for the Slack API
Sqwack - Semi-realtime profile photos in Slack
tourdefrance-slack-bot - Notifies a Slack channel/group for every stage during the Tour de France 2014
versioneye-slack - Post VersionEye notifications to Slack
VoiceChatAPI slack command - Create a VoiceChatAPI room from Slack
wordpress-slack-notifier-plugin - Sends post published notifications to Slack
worldcup-slack-bot - Notify a Slack channel for every match during the 2014 World Cup

Python

asterisk-slack - Publishes Asterisk call information to Slack
butterfield - Python Slack bot framework using asyncio and Slack's RTM API
changetip-slack - ChangeTip Slack Tip bot
django-slack - Slack integration for Django, using the templating engine to generate messages
django-slack-oauth - Slack OAuth module for Django
ellie-slack - Eliza's younger, hipper, psychobabble-friendly successor as a Slackbot
errbot - A plugin-based chatbot designed to be easily deployable, extensible and maintainable
flask-slack - Flask extension which makes it easy to interact with Slack slash commands
fs-slack - Silly slash command synthesis for Slack
gmail2slack - Send a Slack notification whenever a new gmail arrives
limbo - A simple, clean, easy-to-modify Slack chatbot
morgenbot - A standup bot for Slack
mqttwarn - Notify Slack from MQTT
openduty - An open source alerting and incident escalation tool
pyslack - Python API Wrapper
python-rtmbot - A Slack bot written in Python that connects to the RTM API
python-slack.com - Python classes for integrating with Slack
python-slackclient (pypi) - A basic client for Slack, which can optionally connect to the RTM API
reach-slack-rtm - Simple Slack RTM chat built with ReactJS and Django
relay - Bare-bones continuous integration using Docker Hub and Slack
scudcloud - Ubuntu client for Slack
sscaas - Slack Slash Commands as a Service
slack - A simple and comprehensive Slack API client
slack-echo-chamber - Crosspost messages from one channel into another
slack-emojis - images for custom Slack emojis
slack-imgur - A random image from Imgur to Slack
slack-overflow - Search Stack Overflow right from within Slack
slack_standup_snitch - A Slack bot that counts the days each user was active on a channel, calling out the inactive users
slack-w3w - Slack Webhook for linking to What3Words
slack-workout - A fun hack that gets Slackbot to force your teammates to work out!
slack-zenoss - A Slack incoming webhook to show events from Zenoss
slackard - A bot for Slack
slackbot - A chat bot for Slack
slackbot-python - A Slack.com bot in Python integrated with Amazon SQS
slackbridge - Bridge Slack channels between companies
slackcmd - A Python script for piping output from the command line to a Slack channel
slackcraft - Slask based WoW bot for Slack
slacker - Slack API Wrapper for Python
slacker-cli - Messages to slack from the command line
slackfred - Interact with Slack via Alfred
slackotron - A Slack bot customizable via plugins
slackpy - Slack client library for specific logging
slacksocket - Python interface to the Slack RTM API
slouch - Lightweight Python framework for building cli-inspired Slack bots
StackStorm Slack Pack - Pack which allows integration with Slack service.
sublime-slack-integration - Post to Slack from Sublime Text 3
tracslack - Trac notifications for Slack
webhook-bridge - micro-service to convert webhook POST formats including Slack
wee-slack - A WeeChat plugin for Slack

R

slackr - A package to send webhook API messages to Slack channels/users from R

Ruby

addon-slack - Send MagnumCI build notifications to Slack
adventure-bot - Text adventures in Slack!
airbrake2slack - Airbrake to Slack integration (through Heroku)
Alfred-Slack-Channels - Alfred WorkFlow to Switch Slack Channels
beach - Small Sinatra app to host web hooks for Slack
capistrano-slack - Send Capistrano deployment messages to Slack
capistrano-slack (II) - Send Capistrano deployment messages to Slack
capistrano-slackify - Send Capistrano deployment messages to Slack
chef-slack - Cookbook to send messages to Slack
chef-slack_handler - Chef handler for Slack
dogetip-slack - Sinatra app to enable Dogecoin tipping via slack
doorbell-server - Simple Sinatra app which acts a bridge between Slack and the LMN doorbell
fastlane - iOS deployment workflow that posts notifications to Slack
gifbot - Integrated animated GIF search for Slack
hatebu-hooker - Post Hatena::Bookmark to Slack
kickslacker - Post progress updates on a kickstarter project to Slack
lita-slack - Lita adapter for Slack
lita-slack-handler - Lita handler for Slack
mina_slack - Slack notifications for Mina
Monit to Slack - Post alerts from Monit to Slack
mslabs-slack-bridge - Bridge between our cloud services and Slack
omniauth-slack - Omniauth provider for Slack
pagerbot - Manage Pagerduty on-call schedules from within your internal chat channels
puppet-slack - Slack Puppet Module for Boxen
puppet-slack (II) - Puppet report processor integration with Slack
redmine-slack - Send Redmine updates to Slack
resque-slack - Post failed Rescue jobs notifications in a Slack channel
semaphore-to-slack - Post Semaphore status messages to Slack
slack-gamebot - A game bot for Slack
slack_notifier - Send notifications to Slack
slack-notifier - A simple wrapper for posting to Slack
slack-notify - Send notifications to Slack
slack-portals - Link two different companies' Slacks together through a common channel
slack-post - Post messages to Slack
slack-poster - Simple gem to post messages on Slack using webhooks
slack-repeater - Repeater bot
slack-rtmapi - All you need to use the RTM API of Slack
slack-ruby-bot - The easiest way to write a Slack bot in Ruby
slack-ruby-client - A Ruby client for the Slack Web and RealTime Messaging APIs
slack-ruby-gem - A Ruby wrapper for the Slack API
slack-semaphore-integration - Send build status messages from Semaphore to Slack
slack-shuffle - Slack integration for shuffling a list with your team members
slack-slam - A key-value store for Slack
slack-timezone-converter - Converts any time string in a message to all timezones where the team is
slackbot - The laziest bot around
slackbot (II) - Bots for Slack.com
slackbot-plugin - Attempt at a ruby-based jenkins Slack notifier
slackbots - A bunch of rad slackbots that run on IronWorker
slackbotsy - Ruby bot for Slack, inspire by botsy
slackcat - Upload files to Slack from the command-line
SlackCI - Command-Line Interface and RubyGem for Slack
SlackEco - Generate memes within your Slack channels
slacker - A collection of scripts for making Slack a little better
slackfire - Send real time events from Firebase to Slack
slackistrano - Send Capistrano deployment messages to Slack
slackr - Talk to Slack from Ruby
slackr-gif-bot - Listens for requests and posts GIFs back to a Slack channel
Slackvant - A simple Slack bot system
slightly-weird - Uploads pictures of users, uses SQS
snarkov - Sinatra-based Markov bot for Slack
spoilerbot - Displays a random card from the latest Magic: The Gathering set
squirt - Upload a file to a Slack channel from the cli
tarumi - A simple library to interact with Slack webhooks
tickbot - Simple team time tracking reminder
trebekbot - A Jeopardy! bot for Slack
vip-notify - Send VIP deployment notifications to Slack
slack-webistrano - Send Webistrano deploys to Slack
yobot - YOs a Slack channel of your choice

Rust

rust-slack - A rust crate for sending messages to Slack via webhooks.

Scala

scala-slack - A Slack client for Scala
sslack - Search Slack by ElasticSearch
slack-scala-client - A Scala Slack client for the Web and RTM API

Shell

git-slack-hook - Git receive hook to notify Slack channels
Sholat-Prayer-Times-Slack - Salat Prayer Times bot for Slack integration
slack - Runs the test suite of a Ruby On Rails application and post the results to Slack
slack-hack - Random bot
slack-rails-ci - Run a command; post it and its standard input, output, and error to Slack
slacktee - A bash script that works like tee command
stash_slack - Atlassian Stash integration with Slack through external web hooks
wercker-step-slack-notify - Send a message to Slack
wercker-step-slack-post - Post wercker deploy status to Slack
zabbix-slack-alertscript - Custom Zabbix AlertScript for Slack

Tcl

eggdrop-slack - Simple Message Relay from IRC to Slack

Zephir

zephlack - Slack Messaging extension written in Zephir

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