Running Heretic 2 on a Modern PC.
Heretic, Hexen, Hexen Deathkings Expansion Pack, and Hexen II on Steam
Get Heretic II free on MyAbandonware, with patches and mods!
Hammer of Thyrion: Hexen II Source Port for Modern Computers: PC MAC and LINUX
GZDoom will work for both Heretic and Hexen wad files, as well as Hexen Deathkings
Hexetic: a hi-res hi-color abandoned source port for Heretic and Hexen
Doom Legacy :: Using Legacy features in Heretic maps
Other ports that run heretic on doom wiki
Hexen/Hexen II entry on the Doom wiki website :: Heretic is also here of course
Heretic's Cheat Codes :: Hexen's Cheat Codes
Heretic Treasure Chest - A 3-Episode Heretic Mapset
/idgames archive: Levels for Heretic, Hexen, Hacx, and Strife