Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.
Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.
Unit Notes for iOS - A simple and powerful note-taking app.
Limnu - Sketch, share and collaborate with your team
Doceri - Doceri is a scalable suite of products that allows a teacher or presenter to control a computer's desktop, to control audiovisual technology, and to annotate any presentation in real time with the Apple™ iPad™.
Draw.Chat - Anonymous real-time whiteboard with text and video chat.