[40281889]

I'd say look into two different source ports: namely, ZDoom and GZDoom.

ZDoom is one of the most popular source ports capable of running all WADs and it's still being maintained. GZDoom is the OpenGL supported version of ZDoom with new scripting capabilities and GL lights.

For Quake 1 there's the DarkPlaces source port, and for Quake 2 there's Yamagi or Q2PRO.

[moonfern]

(G)Zdoom can play all wads made for other ports but it's not backwards compatible with wads made for older version of zdoom. And that's a pity besides you have to change many default options to play "doom" like it was. In original doom monsters have infinite height, so you can't walk on monsters,pass under flying monsters. Looking up/down, jumping and making the bfg more powerfull are other changes. Great mods, wads and even indie games have been made with g/zdoom but the topic is the original doom movement. In that context people use mostly prboom + or chocolate doom.

[AgentME]

>ZDoom and GZDoom

and then there's Zandronum, which is built on GZDoom and adds modern multiplayer features (servers, in-game joining, etc).