Virtual classroom with whiteboard, text chat, audio chat. You can upload images to the whiteboard, draw, and enter text. No registration required. Words on iPads as well as web browsers.
Limitations: No video chat. No option to upload a PPT or PDF.
Application for instructors to create lessons that students access on iPads or computers. Collects data in polls. Teacher and students can draw on images or a shared whiteboard.
Create a sketch, share it with students.
Could be useful for practicing writing of languages that use non-Latin characters. Can be used on smartphones, tablets, Smartboards, computers, etc.
Simple white board for drawing, including text. Also available on iPhone and iPad as a web app. Can be used to create animated GIFs. Completed drawings can be saved.