Dropbox isn’t specific to teachers, but it’s a very handy tool. I’ve spoken with many teachers who use it with their students to share documents, turn in homework, etc. If you haven’t already given Dropbox a try, I’m telling you, it’s worthwhile. It’ll make your life so much easier.

WordPress is a blogging platform that allows you a lot of versatility in the kind of content you can offer. Create a class blog where you post links to helpful readings and give updates on assignments. It’s free to sign up and start a blog.

Prezi is a really neat cloud-based presentation program that allows you to zoom in and out. If you don’t mind your slides being public, you can sign up for a free account with 100MB of storage.