I've discovered Natron recently, and I'm so enthousiast about it that I wanted to share it with you. This free and open source software is an alternative to softwares like After Effects, Nuke, etc.
Free and open-source compositing software, available for MacOS X, Windows and Linux.
Check it there: http://natron.fr/
And an overview/tutorial: https://youtu.be/saEENGQbn6c