EXtendable WAD Editor

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Homepage:

http://www.doomworld.com/xwe/

• many, many features, such as:
  • Lump management
  • Create/Merge/Clean Wad files
  • Import/Export
  • Map Editor
  • Image Editor
  • Texture Editor
  • Palette Editor
  • ColorMap Editor
  • 'Endoom' Editor
  • Script Editor/Compiler
  • Wave editor
  • Music viewer

and if that would not be enough, it supports a gamut of other games:
Doom, DoomII
Adrenix
Alien Trilogy
Blake Stone
Blood, Blood 2
Chasm: The rift
Corridor 7
Dark Forces
DeathStar
Descent 1, 2
Duke Nukem 3D
EOB1, 2, 3
Eradicator
FAKK2
Foresaken
Half-life (partial)
Hexen
Heretic
Lands of Lore
MDK
NecroDome
Op. Body Count
Outlaws
PowerSlave
Quake 1, 2, 3
Realms o. t. Haunting
Redneck Rampage
Rise of the Triad
Scrapland
Shadow Warrior
Shogo
Strife (SW)
System Shock
Thief
Ultima Underworld I
Unreal
Witchaven
Wolfenstein3D