One of the tools I have encountered that I am excited to use is Collaborize Classroom. This website is incredibly useful as a way to check students' understanding and to promote discussion. It is a website but it is also available as an iTunes app.
Some of its features:
- password protected so only teacher and students can access
- take a poll
- hold a debate
- supports attachments
- analyzes results (shows what percentage of students chose which multiple choice option as the correct answer, for example)
- allows you to sort students into groups
I think this website will be a great resource for discussion post/forums and for grouping students together. It reminds me of Canvas with a little less functions, but it's free! I'm excited to have the opportunity to use this tool in the future.