Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Rainglow Color Themes - 320+ color themes for a variety of editors and software.
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Slack Themes - Make your Slack pretty with custom themes
Board for Github - A webview based GitHub project app with native features
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.