Doom Video Vault
I Love YTtalk
Might I recommend some if you have Steam? I would recommend Quake, Quake 2, Doom, Doom 2, Final Doom and the original Half-Life. All of them are pretty cheap (esp Final Doom, Doom & Doom 2 are all $4.99 each) and the good thing is for all the communities mentioned have a pretty healthy community, especially Doom's as there are tens of thousands of user made levels, hundreds of mods of all sizes and dozens of source ports to play them under Windows. 
If you're gonna buy Doom, purchase them separately and not Doom Classic complete or Doom 3 BFG Edition. Last I remembered the core files were altered to edit the crosses off the health packs because of Red Cross trademark whining and total removal of any Nazi related content in Doom 2's secret levels, including the SS guards that make the levels unique.
I personally use GZDoom for my Doom festivities and Darkplaces for the original Quake.

If you're gonna buy Doom, purchase them separately and not Doom Classic complete or Doom 3 BFG Edition. Last I remembered the core files were altered to edit the crosses off the health packs because of Red Cross trademark whining and total removal of any Nazi related content in Doom 2's secret levels, including the SS guards that make the levels unique.

I personally use GZDoom for my Doom festivities and Darkplaces for the original Quake.

