http://livetyping.com/
A trial:

LiveTyping.com
How can I use this tool with students?
- As you can choose the typing speed (the speed the text appears in the box), I guess you can type in a text and ask sts to practise reading aloud.
- You can type in a text and then ask students questions about it.
- Students can create their own texts using target structure and then publish them in a class blog.
- The whole class can create a collective story, each student typing a part of the story, and then click to generate the final result.










