GlPortal is a cross platform puzzle game inspired by the game Portal
GlPortal is a free game for GNU/Linux, Windows and Mac OS X. The Objective is to reach the cake by means of teleportation. GlPortal is under heavy development. It is not a Portal clone (Is GlPortal is a free Portal clone?) and instead features its own story around an ambitious lab assistant named Ada that has to solve dangerous tasks for science on a daily basis. Her sidekick, a know it all Robot with a more then impressive laser canon and an overexcited professor support her in her mission. Most of the time she has to dodge lasers and bullets while preventing the destruction of all life on earth. She is aided in her quest by the newest flipedy flopy gizmo created by the engineers downstairs.
http://glportal.de/
http://directory.fsf.org/wiki/GlPortal
http://www.indiedb.com/games/glportal/downloads