Nullboard - Minimalist locally-stored kanban board / task list manager.
The Answer Bank - The Answer Bank is the UK’s leading question-and-answer site.
OpenHub for GitHub - Fast and concise, open-source GitHub client app.
wikiHow - wikiHow is a wiki based collaboration to build the world’s largest, highest quality how to manual.
Huboard - HuBoard is built from the ground up using the GitHub public API.
Blurtit - Blurtit is a Q&A website. You can ask a question or answer on any question.