This application allows you to use your android phone as a touchpad.
It is in development so it can have some bugs.

You can move the mouse, right-click and left-click.

It works with an application running on your computer ( you download it here). You need to have java on your computer (download), it was tested on Windows but it should work on OSX and Linux.
The computer and the android phone must be connected to the same local network.