Bumblebee
From Hybridgraphics
Bumblebee allows you to run specific programs on the discrete graphic card, inside of an X session using the integrated graphic card. It's written by Martin Juhl and published under GPL v3.
Installing it
git clone https://github.com/MrMEEE/bumblebee cd bumblebee ./install.sh
TODO : import infos from http://www.martin-juhl.dk/ and from the README