alt Hacker NewsAnd Quake 3: https://thelongestyard.link/q3a-demo/
And Unreal Tournament: https://dos.zone/mp/?lobby=ut
There's also https://noclip.website/ which, while not playable, has hundreds of levels from dozens of older games that you can explore freely. Including Half-Life 2, with more accurate rendering than this web port (which seems to be missing many shaders including character eyes).
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Doom 3, smoother on Macbook M1 but it's too dark that I need to actually increase brightness on Firefox reliably. Is there a better solutions?
Everyone posting links made me want to find HL1 in browser: https://x8bitrain.github.io/webXash/
Also The Simpsons Hit & Run! https://shar-wasm.cjoseph.workers.dev/
And Diablo: https://devilutionx.app
And Duke Nukem 3D made by my friend Gawen: https://gawen.me/webduke
That was fun thank you, haven't played quake 3 in awhile, so many memory neurons firing!
And Tomb Raider
https://eikehein.com/stuff/sabatu
Fan remake of the levels to avoid asset copy, but it's a downstream of the original engine (and loads the original level files just fine), so the real game.
And Red Alert 2: https://news.ycombinator.com/item?id=45991853
And CS: https://play-cs.com
Also xonotic! https://www.xonotic.gg/
noclip website is so dang cool, petition for them to add music. I'd cry if I could hear those ragnarok map songs while exploring.
I vibe coded this for exploring levels in the original Deus Ex: https://dxwebview.pages.dev/ (https://github.com/addrummond/dxwebview).
It's a bit janky owing to the vibe coding, but the basic functionality works pretty well. You need the original game data files to use it.
There's also Ultima Online in the browser (sanctioned by the official servers). I'm one of the maintainers.
https://retail.classicuo.org/