Sutle - Save and organize resources into a directed learning path.
Golden - Mapping all human knowledge
Gigasheet - The cloud spreadsheet built for big data.
Postly - Turn your photos into REAL beautiful postcards. Available on iPhone, iPad and Android. Make friends and family smile with a postcard!
Resource Center by Userflow - Userflow's new Resource Center lets your users access help directly in your app.
Developer's Guide to Content Creation - The book for devs who want to make quality technical content