A few that come to mind for me are

  • ASCII Sector - space roguelike that was released in the last 2000s
  • Sonic Robo Blast 2 - free 3d sonic fangame, built using a Doom engine of all things…
  • ClassiCube - free sandbox block-placing game that is similar to 2009/2010 Minecraft Classic
  • Chronicles of Denzar - free browser-based RPG similar to dragon quest (previously PhantasyRPG.com) running since the early 2000’s