Are you talking about WAD files other than DOOM1.WAD? The answer is no. The rest are commercial.
There are user-made WADs (PWADs) but those require a commercial version of Doom to work.
I reccommend you search for Final Doom on EBay. You'll probably find it for a fairly low price. Final Doom contains all the commercial Dooms: Doom, Ultimate Doom, Doom II, Plutonia and TNT.
AFAIK all WAD files will work in gfDoom. Any WAD's will run on any hardware provided the Doom port is OK. WADs only contain sounds, art and maps; there is no hardware-specific or even processor-specific code.
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