Courseroot - Biggest online course database on the web
tutoit.io - Create an in-app measurable tutorial with a single click
Alcamy - Free, open self-learning platform. Learn & teach anything.
DebateArt.com - DebateArt is a unique and growing community committed to the idea of exchanging views and perspectives through debating.
Startup Stash - A curated directory of 400 resources & tools for startups
Kialo - Kialo is the platform for rational debate. Empowering reason through friendly and open discussions.