KFH Games has recently released a beta version of Klooni SDL version 1.4 - A Doom clone (a Doom to Wolf3D conversion that brings much of the Doom gameplay to Wolf3D). It contains 6 very good episodes. Requires either DOOM2.WAD, PLUTONIA.WAD or TNT.WAD from Doom II or Final Doom to play.
Available from KFH Games. Vista/Windows 7-compatible.