Play Doom online, maps

http://mauweb.net/3.0/en/play-online/53--play-doom-online.html
http://www.classicdoom.com/
http://www.classicdoom.com/maps/d1exit/d1.htm
Quake
http://www.arcadecabin.com/fullscreen/quake_flash.html
http://www.quakelive.com/#!guide
http://www.youtube.com/watch?v=NJgc9Xo0U9o&feature=related