These games may have launched decades ago, but the work (and play) continues even today.

Two Stop Bits

A curated list of PC games from the 1980s and 1990s that continue to receive active development updates decades after their initial release. Featured titles include Klondike (1984), NetHack (1987), GemStone IV (1988), Kingdom of Drakkar (1989), Genesis (1989), UnReal World (1992), Meridian 59 (1996), Furcadia (1996), Ultima Online (1997), Utopia (1998), and Age of Empires 2 (1999). Many are text-based MUDs or early MMORPGs maintained by original creators or dedicated volunteer communities, with some transitioning from text to graphics over time. Several remain subscription-based or have active player communities, demonstrating remarkable longevity through continuous updates, new content, and platform migrations including Steam releases and mobile versions.

The '80s and '90s PC games unbelievably still being updated today

This is programming for the joy of it. So cool!

I think WoW can be included as well, altho not 90s by a little bit

How was EverQuest not included on this list? They just had an update December 2nd.