Discovered the DOS modders a few years ago, and thought "oh wow, this is pretty big". Biggest one that I noticed was for Doom.
There is actually quite big community of modders of DOS games and nostr:nprofile1qqsre6jgq6c7r2vzn5cdtju20qq36sn3cer5avc4x8kfru5pzrlr7sqpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcprpmhxue69uhhyetvv9ujucm4wfex2mn59en8j6f0qyv8wumn8ghj7un9d3shjtnsd3jkyum5wghxxmmd9us9zd4y is working on Nostr friendly solution for those 😊
Discussion
Yeah, Doom is probably the biggest. There are communities for Prince of Persia, Commander Keen. Transport Tycoon is mostly around OpenTTD, Civilization is I think FreeCiv.