Magic DosBox, not a game. But in combination with www.old-games.com , it’s a pretty good selection of all the old games made for Dos back in the wild west of indie games back before they were even called that. There are, of course, also old commercial games that have transitioned to freeware now too. Should be able to find lots of awesome games there. Moraff adventure games are particularly interesting. Bit of a steep learning curve, but great to come back to now and then. The site has reviews of every game and sorts them into categories. It can be a little overwhelming just due to the sheer number of available games, but take it slow, and work your way through. It’s worth the time investment to find gems.