I recently received an email from a reader who was looking for some tools that she could use for online tutoring/ instruction. The catch was that she needed to be able to share a whiteboard with her students. That's not an unusual request because whiteboards can be invaluable when trying to explain a mathematics concept online. These are the suggestions that I offered to her.
Web Whiteboard for Google+ Hangouts. This little tool adds a whiteboard to your Google+ Hangout. You can draw on the whiteboard while still taking advantage of all of the other features of Google+ Hangouts like voice, video, and text chat. To use Web Whiteboard in Google+ Hangouts simply go to the site and click G+ Hangout.
Stoodle is a free collaborative whiteboard tool hosted by the CK12 Foundation. You can use text chat while sharing your whiteboard. Registration is not required in order to use Stoodle. In the video embedded below I demonstrate the features of Stoodle.
Join.me offers a whiteboard tool in their video conferencing system. There is a free version of Join.me available. The free version does limit some of the functions, but you can try the full version for free for up to three weeks. The other limitation is that you do have to install the desktop client or the iPad app in order to use Join.me so it's not an option for Chromebook users.