Top 5 bugtracker open source projects

Distributed, offline-first bug tracker embedded in git, with bridges

TIKET is a ticketing/helpdesk system to support and help you deal with issues/incidents in your organization or from customers.

Issue tracker for Kaiserreich for Hearts of Iron 4

The easiest way to get website internal / customers feedbacks (WebExtensions)

Laravel wrapper for the YouTrack PHP Software Development Kit provides set of tools to interact with JetBrains YouTrack.