Wow, RGBClassicGames.com has over 300 old-school Dos games currently available and free-to-play via browser (Java). That’s a lot of friggin games. These little gems of yore are shareware, freeware or abandonware that the fine people at RGB Classic Games want to preserve for future generations to enjoy. I just experienced some serious flashbacks.
Sure, there are some obscure ones in there but you can also play some retired all-stars like: Doom, Star Wars: Dark Forces, Wolfenstein, Sam and Max, Earthworm Jim, and Mega Man X to name a few.