Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Change My Mind - A platform where people can anonymously discuss and share believes on any topic.
Anchor CMS - Free and lightweight blogging system
Staance - State your opinion on politics, tech & more with a click
Textpattern - Textpattern is an elegant content management system that is free, open source software.
DEBATE-A-BOT - Online debates with bots impersonating politicians