Stoodle

Description: Someone knows what you need. Someone needs what you know. Stoodle makes it easy to learn from and teach fellow peers online, whether you're a student or a teacher, for free. Features include real-time collaboration on a virtual whiteboard, real-time communication through voice conferencing and text chat, permanent storage of all classrooms for later access, and ccess to basic drawing tools and colors.

Website: stoodle.ck12.org