Contemplated writing your own "choose your own adventure" or text-based game but thought it would be too difficult? Free storytelling tool Twine makes it a piece of cake.
It all gets published in HTML, so you can post or link it anywhere, and you're free to do whatever you like with what you create. The only downside is that it doesn't give you much of a tutorial, so you'll need to do a little research in the wiki to learn how to do the really cool stuff. If you've got a story that needs to be told, you can download Twine for free on Windows and OS X, or run it in your browser all at the link below.