Narbacular Drop - Using two interconnected portals you can place on walls, ceilings and the floor, you must navigate your way through a sentient dungeon.
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
Quantum Conundrum - Quantum Conundrum is a First-person Perspective game with strong Sci-fi, Puzzle-Platform, and Single-player elements published by Square Enix and developed by Airtight Games.
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
GlPortal - A free open source game with teleportation.
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.