What are some interesting start ups in the education space?

Ones that multiple people think are interesting:

• CK-12: Free Online Textbooks, Flashcards, Practice, Real World Examples, Simulations. Free digital textbooks and supplemental content for all Middle and High School STEM (full curriculum included!)
• Learnyst: (http://Learnyst.com )
•  Helping educators build their customized & branded online school in5 minutes and sell courses.
• Create & sell your own 
•  online courses on your own website - Thinkific.com
• XDiscovery: Knowledge recommender system. Obtain knowledge correlations and knowledge maps for all entities. (Here a mobile version applied to Wikipedia to learn in seconds with visual knowledge maps for all4 Million topics - http://learn.xdiscovery.com ) Founders: Luigi Assom, Alessandro Codello
• FindMyCoaching : (http://www.findmycoaching.com ) - Search, compare and sign-up for best coaching classes.
• • Admission Table (http://www.admissiontable.com/) - Find international universities through your peer group, and connect with universities directly
  • Academic Room (http://www.academicroom.com) - social platform for academics being built out of Harvard i-lab. Founders: Harpreet Singh, Sarabjot Kaur.