This site allows you to make any page interactive for your students. "You can take your students to any destination on the Web, interact with them, guide them, collect and assess their work seamlessly." - Free option is limited to 50 single use student accounts. Upgrade for unlimited is $5.99 a month.
Ad supported, but there are ad free options available. You may have as many as 200 attendees and 6 video streams. Integrates with your Google account even if using Google Apps for Education. Recording is also available and FREE.
Make your lessons more dynamic by creating your own flash and smartboard games or other cool activites. All tools are FREE. Tools included: QR code generator, Fake Facebook and Twitter pages,
Free with ads. Great online tool for playing with images. You can make all sorts of thinks from posters to nametags. There is a color palette generator and a way to make trading cards.