NinjaClick is a auto clicking application. NinjaClick is a free easy and simple open source auto clicking application. It's only available for Windows at the moment, but a Linux version will be in the mix shortly.
Just change the text from 10 to any other number, and click the check mark, and the clicking time will change (NOTE: The smaller the number the faster the clicks) You can go to File/Start to start the app, or press F1, and F2 to stop.

The license of this software is Free, you can free download and free use this mouse & keyboard software.