dunno if these count, but they've been around for a while and not much (if anything)'s changed, mostly just security patches and the occasional bug fix.
Audacious is one of them - it's fairly old by this point, it even has visualisers, it runs perfectly fine on lower res 4:3 displays, it's perfect for older machines with Alpine or Artix or even MX if you strip it down, etc. and it's perfect for all i wanna do - just play MP3, OGG, and FLAC files that i download lol
VLC, Pale Moon, Audacity, Akregator, KolourPaint, Psi, Thunar file manager, etc and even the DE being XFCE could also fit into this lmao
they're still perfectly fully supported, but unlike Windows or MacOS and things, these remain lightweight as heck and they look not much different at all since when they were first out lmao
i think, if i remember correctly, many of these programs were out since the 2000s? some possibly since the 90s and some the 2010s, but the attached image is of Audacious lol
it so happens to be an old UTAU song from then too!
edit: also Touhou Mountain of Faith (2007), UTAU (2008), Minecraft Java Edition 1.5.2 (modded) (~2013), etc are pretty old too. not MS-DOS old no way, but definitely not new.