A WAD editor allows you to edit WAD files to add and modify sprites, music, DeHackEd patches and other things. Some level editors have a WAD editor built in, like DeePsea.

MacEdit

• Deimos
• WWKSuite
• Hellmaker
• Wad Builder

WindowsEdit

• WinTex
• NWT and NWT Pro
• XWE, http://www.doomworld.com/xwe/
• WadAuthor
• Doom Builder
• Doom Engine WAD Reader and Extractor, http://www.terrybutler.co.uk/tools/doom-engine-wad-reader-and-extractor/

Linux/UnixEdit

• DeuTex/DeuSF
• Yadex

External linksEdit

• Doomworld's list of editors (comprehensive)