GitHub Visualizer - Enter user/repo and see the project visually
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.
Octohunt - Search to find developers in your city on Github.
POAP - POAP is a new way of keeping a reliable record of life experiences.
Gource - Gource is a software version control visualization tool.
PageMarker - Save, organize, annotate and revisit your bookmarks