Top 6 scrobbler open source projects

Last.fm scrobbler for Spotify Connect

A command-line Last.fm scrobbler and a now-playing status updater.

Browser extension to automatically update your Kitsu library from streaming sites

Serato ScratchLive! / Serato DJ Scrobbler and Twitter bot

An alternative scrobbler for iTunes and Music on macOS 10.12 or higher

Scrobbling from YouTube to Last.FM - Userscript for Firefox and Chrome