BaiBoard
http://www.baiboard.com/Create, share and collaborate on your knowlege
BaBoard is a cloud based mobile collaboration app that enables users to create, share and collaborate knowledge through whiteboard, PDF, images, and voice conferencing. Using BaiBoard on iPad, educators could easily build course multi-content course material and collaborate with students in real-time or asynchronously. BaiBoard currently has 200,000 active iPad users that are creating content or collaborating with others.
Angel list: https://angel.co/company/baiboard
Member count: 1-10
Total raised: $100K