SourceForge - The Complete Open-Source and Business Software Platform.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
openDesktop.org - The website openDesktop.
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
OSOR - OSOR is the Open Source Observatory, a project to provide a framework for developing and executing autonomous observations.
Zube - Project management for developers.