Portal: Project Beta
PuzzleA Portal 1 beta mod using 2006 Valve beta assets and maps.
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PuzzlePortal: Still Alive, but instead of it being a mod on your Steam library, it's a map pack you can find in Bonus Maps.
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PuzzlePortal: The Second Slice is a mod that aims to remake concepts from the lost “core hub” era/version of portal 2 in portal 1 and extending on them.
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PuzzleIntroducing Exercise Caution, a mod which explains the events after GLaDOS' destruction by the hands of Chell. In this mod, you play as Robert Knoll...
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PuzzlePortal: Prelude, as its name implies, is an unofficial prequel to the game Portal. Its story revolves around the pre-GlaDOS epoch way before she was plugged...
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Aperture
PuzzleThe story is rewritten in the fashion of a community project. Aperture features 19 test chambers and an escape sequence.
Psychological Instability
Puzzle152 other test subjects couldn't do it. Is there any hope for you? Will you die during the test? Will someone come for you? Will something happen? Will...
Portal" DE-RTX-D
PuzzlePortal: De-RTX-d is a mod for Portal 1, that adds assets from Nvidia's RTX remix version of Portal RTX, but without actual RTX
Rexaura
PuzzleRexaura is a mod for Portal based on high energy pellets and several new mechanics surrounding them.
Aperture Escape
PuzzleAs the sun sets at the beginning of a long weekend, an entrapped employee within the facility looks to you for help. Think outside the test chamber as...
Gamma Energy
PuzzleGamma Energy visits the Aperture Science East facility, built after GLaDOS gained sentience. The goal was to create a facility where GLaDOS' research...