Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Google Open Source - All of Googles open source projects under a single umbrella
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
SmallDevTools - Handy developer tools with a delightful interface
Board for Github - A webview based GitHub project app with native features
whatdevsneed - This is whatdevsneed.