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“ZDoom is a Doom source port, originally based on ATB Doom and NTDOOM, that was first released in...ZDoom
“GZDoom is a ZDoom-based port which is maintained by Christoph Oelckers (Graf Zahl). It was first...GZDoom
“SLADE is a modern, open-source map editor for Windows and Linux created and maintained by Simon...SLADE
“Zandronum is an open-source multiplayer source port forked off from the most recent development...Zandronum
“UDMF (or unabbreviated to Universal Doom Map Format) is a specification for laying out maps in a...UDMF