Vavoom is a source port based on sources of Doom, Heretic, Hexen and a little bit from Quake.

To play Vavoom you need main wad file from one of the following games:

Doom shareware
Registered Doom
Ultimate Doom
Doom 2: Hell on Earth
Doom 2: TNT Evilution
Doom 2: The Plutonia experiment
Heretic shareware
Heretic registered
Strife shareware