Alcamy - Free, open self-learning platform. Learn & teach anything.
Sutle - Save and organize resources into a directed learning path.
EduDo - EduDo is a video discussion platform
Postly - Turn your photos into REAL beautiful postcards. Available on iPhone, iPad and Android. Make friends and family smile with a postcard!
Developer's Guide to Content Creation - The book for devs who want to make quality technical content
Golden - Mapping all human knowledge