Thrive was inspired by Spore, and many others.

https://www.revolutionarygamesstudio.com/

You seem like you might like osgameclones.com. It's absolutely massive because it includes projects even if they're unfinished or abandoned, but you can sort by playability, development status, even programming language if you're looking to contribute.

Beside the already mentioned Open Source Game Clones there's also this list on GitHub.

As for specific titles, I'd like to add:

• Fallout Community Edition and Fallout 2 Community Edition
• VCMI (open-source engine for Heroes of Might and Magic III)
• OpenGOAL (port of Jax and Daxter, second and third game in development)
• OpenGothic (officially only supports Gothic 2 but works with the first game as well)
• Perfect Dark port
• Super Mario 64 Port
• TRX – Tomb Raider I & II: Community Edition

There's also WipeOut Phantom Edition but this one isn't open-source so I'll just leave it here in case someone wants to check out the existing build.

Star Wars Jedi Knight I and II: Jedi Academy and Jedi Outcast (Not stable) - OpenJK https://github.com/JACoders/OpenJK

Despite the official name being "Jedi Knight: Jedi Academy" it is not Jedi Knight I. It is actually a sequel to Jedi Knight II: Jedi Outcast. It came out only a year after JO and was announced in April. At first I thought it was an April Fool's joke because the screenshots looked like something that could easily be made with the mod tools at the time.

It wasn't called Jedi Knight III because you play a different character.

Anyways, the real Jedi Knight I was "Jedi Knight: Dark Forces II". An open source implementation is available at https://github.com/shinyquagsire23/OpenJKDF2

And to round it off, the open source implementation of Dark Forces is available at https://theforceengine.github.io/. I think it even supports the remaster.

It’s a shame that Another Metroid 2 Remake got Cease & Desisted, purely because Nintendo was about to release Samus Returns and didn’t want to compete with a fan game that was better.

It's not finished yet but OpenXray Gunslinger is probably going to be a better STALKER: Call of Pripyat remaster than the official one that just got announced.

• Super Mario Bros. X is a Mario fan-game remake that uses lots of assets from the SNES era of Mario games (Super Mario World, Super Mario All-Stars, Super Mario RPG).
• Sonic Robo Blast 2 is a Sonic fan game made from the Doom engine, inspired by the Sega Genesis era of Sonic games.

They're both open-source.

I've edited the post, so it looks more appealing. Sorry, that it was so hard to read at first, i hope now it's better

https://osgameclones.com/ is the best aggregate for this kind of thing.
https://libregamewiki.org/ also looks like something relevant.

Maybe now that we have a messy thread of various links, we can go check whether some of them are not yet listed in osgameclones.

Don't forget the Xash3D engine for GoldSrc games (e.g. Half-Life and mods). It runs on everything from a PSP to a PC. And it's faithful. It relies on the original assets.

https://github.com/FWGS/xash3d-fwgs

Oh, also ScummVM should always be included in such a list. It supports a ton of classic adventure games from LucasArts, Sierra and others. And by now even Might and Magic 4+5: World of Xeen.

OpenRA https://www.openra.net/ to play Red Alert, Command and Conquer and Dune 2000

Widelands - Settlers II inspired game, played a couple of hours, pretty neat.

FreeCIV - how can that gme be missing here? :)

UnCIV - Civ V clone, also pretty neat

Throw Manic Miners on there. It's a fan remake of the old Lego Rock Raiders game, and it's really fun. There's a custom level builder and I think there's a browser you can search for other custom levels.

How come there's no mention of 0.A.D, it has amazing graphics, at least from the videos and screenshots. Haven't gotten a chance to play it unfortunately.

XCOM 1 (UFO Defense) and XCOM 2: Terror From The Deep - OpenXCOM https://openxcom.org/

Master of Orion 1 - 1oom https://github.com/1oom-fork/1oom

Ultima 6 - Nuvie https://github.com/nuvie/nuvie (apparently now part of ScummVM)

Here's my list:

• Pingus - a lemmings remake
• X-Moto - an elastomania clone (2d physics-based motorcycle game)

Would Ship of Harkinian go on here?

There is also Warzone 2100 https://wz2100.net/

Whole Lee Shit jazz jackrabbit brings back memories. I remember my first time playing it at a friend of the family's house, there was a dude there talking shit about how Windows was for lazy people (I was very young and windows was still kinda newish)

But how dare you not include OpenMW! Imagine having an og Xbox masterpiece on your phone, and you can mod it!

https://www.macsourceports.com/

Morrowind: https://openmw.org/

Legacy of Kane Blood Omen fan remake - https://omnicide.razorwind.ru/en/