Dialog Messenger - handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited
GHuser - Better GitHub profiles for everyone
Ripcord - A desktop chat client for Discord and Slack
Octohunt - Search to find developers in your city on Github.
Ziggs - Smoothly Share Content Between Devices!
GitHub Visualizer - Enter user/repo and see the project visually