Commit Together by Github - Now add co-authors to your commits
Rainglow Color Themes - 320+ color themes for a variety of editors and software.
GitHub Marketplace - Tools to build on and improve your workflow
Slack Themes - Make your Slack pretty with custom themes
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.