Playing Heretic

Heretic can be played: However best played on one of the source ports (available for XP, 7 and 8 + Mac and Linux) both Doomsday or ZDoom are OK and you get the added advantage on Doomsday of some excellent new textures and models.
 * Natively on OS's up to Windows 98
 * In DosBox for OS's Windows XP, 7 and 8

Doomsday: http://dengine.net/

ZDoom: http://zdoom.org