my list
-Morrowind, it was made for xp, but its modding community can shape the game to what you want in terms of graphics and even content
-Rome/Medieval 2 Total war, Same story as morrowind, but a single campaign if your a sperg like me can last over 20 hours, they also have some great mods, admittedly to a lesser degree
-Mount and Blade/Mount and Blade: Warband. you can get the original for like 2 bucks and test out the mechanics and see if the game is to your liking, Napoleonic warfare is my preferred fps due its variety of game modes
-Halo 2 cartographer abandonware edition, a classic for free, with a decent modding community and (in my opinion) the best story in the series.
-Stronghold Crusader, a classic rts with city building mechanics, its cast of goobers offer a variety of challenges and insight into the different play styles.
-Terraria, a good sit down and comfy while also having the ability to be a boss rushing bullet hell.
-Touhou, they are a series of short but difficult games, their fan games are hardly demanding and are often free imitations of other games
-Recetter, Capitalism HO, a trading game with a neat dungeon mini game, a toaster could run it.
- Xcom series, with the exception of XCOM 2 I can run all the games on a $200 HP laptop
I could probably scape up more, but this should be a good starting list
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