Sketchboard.io - Visual Remote Teamwork. Solve problems and create ideas on endless whiteboard with your teammates by sketching.
Synology Note Station - Without needing to spend money on Evernote, Synology Note Station provides a desktop client to organize all your random notes in one place.
Draw.Chat - Anonymous real-time whiteboard with text and video chat.
UpNote - A beautiful and clean cross-platform app for notes organizer
MultiDraw - Draw with others in real time.
Notesnook - Notesnook is a simple and private note taking app that keeps your notes organized and synced on your phone, tablet and computer.