Let's Play Doom Mods - Equinox.wad & Psychic Part 5 : Murder in the Hanger & UFO
http://lparchive.org/Doom-Mods/
Equinox is a "classic" wad of 13 Maps, featuring new sounds & textures. Pretty enjoyable, the maps are fun to play, even if the end is a bit ridiculous.
Link : http://www.doomworld.com/idgames/index.php?id=11412
Psychic is a gameplay mod which works with any "classic" wad, including the official Doom iwads like doom.wad, doom2.wad, etc. You get to use awesome weapons (which doesn't use ammo) as well as psychic powers, and you get to upgrade all of these with money you collect on dead monsters and ammo spawns. You can also buy various powerups to help you defeat hard fights, as well as binding them to shortcuts to easy access.
Link : http://forum.zdoom.org/viewtopic.php?f=19&t=21681&sid=9cf5fdf922705bdb9ae3722debfe476d