Narbacular Drop - Using two interconnected portals you can place on walls, ceilings and the floor, you must navigate your way through a sentient dungeon.
Portal - Financial Aid Award Letter, - Messages and Calendar, - Grades.
GlPortal - A free open source game with teleportation.
Antichamber - "A game with half of the attention to detail and imagination Antichamber has would be a smash hit - this bare-bones first-person puzzler is one of the most thought-provoking, engaging, and challenging video games ever developed.
Portile - Portile is a 2d, tile-based take on Narbacular Drop (more than Portal, because momentum plays a big...
The Talos Principle - Philosophical first-person puzzle game.