With Google drawings you can easily create, share, and edit drawings online.
11 Ways to Teach Math with Google Drawings - Blog, June 29, 2016
Googlink: Using Google Drawings like a Thinklink - Blog, May 16, 2016
Angles on Google Drawings - Video tutorial - January 2016
Teaching Math with Google Drawings - Video - November 5, 2015
How Your Students can use Google Drawings to Create Greeting Cards - Blog, March 1, 2016
5 Easy Google Drawings Tricks that Students LOVE! - Blog, January 28, 2016
Google Drawings for Graphic Organizers - Webinar - December 4, 2014