The Flashpoint Archive is a big project to preserve old web games (Adobe Flash based games, animations etc).
It has a really cool video about what it does on its website: https://flashpointarchive.org/
Go check it out. It’s literally a treasure trove of old games.
Here are some screenshots:
Even better: i just saw this:
you can even download a personal copy of all the games on the entire archive! for those of us who make backups of things.