This virtual classroom/web meeting application allows you to meet with up to 200 people for free. You can video chat, share your screen, run polls, and present PowerPoint shows.
Sync presentations to all devices, add comments and discussion on slides.
Useful in live classroom.
Limitations: Presentation only saved for 4 hours in free version.
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.
A browser extension that gives you an enhanced video player for YouTube videos. It allows you to slow the video and zoom in.
Limitations: You will need a blog or webpage to embed the video.