Freeliner is basicaly a free/libre geometric animation software built for live projection mapping. It grew from simple polka dots folowing lines to a feature full "VJing" software. It's current state is a work in progress aiming for a 1.0 release at some point. Freeliner does not aim to be extremely easy to use, but once you understand the workflow the possibilities are endless.
Users should not have look at their screens and focus on the environement instead. Users should be able to do nearly everything via mouse and keyboard. Focus on improvisation. Extendable via OSC. Remain lightweight for older hardware. GNU/Linux is the primary platform. Have fun.
Freeliner is built with Processing . Its easy to set up, offers usefull libraries, well documented, and well maintained.