Garbage - In my opinion, poor quality Whiteboard paint, do not buy
Curator - The visual notes app, now on iPhone!
Ziteboard - Ziteboard is an zoomable online whiteboard that lets team to collaborate in real-time.
ML5.js - Friendly machine learning for the web
Idea Paint - Create a usable, interactive space on any flat surface
Voynetch - Share your visual notes and graphic recordings.