Gaerzi: Editors I recommend:
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GZDoom Builder (Windows only): the best and most advanced editor available. While it has a lot of fancy bells and whistles to support the advanced editing features offered by the ZDoom and GZDoom source ports, it is also perfectly capable of making maps for other source ports or vanilla; so don't let the name fool you into believing it's only for GZDoom editing. GZDoom Builder is a fork from Doom Builder 2.
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SLADE 3 (Win/Lin/Mac): good map editing, though less advanced and less stable at the moment than in GZDB (this part is still in development), it offers comprehensive resource editing that GZDB, as a pure map editor, does not have. Note that you can setup SLADE 3 to open maps in GZDB.
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Eureka (Win/Lin/Mac): a more old-school approach; doesn't support the new map format needed for advanced ZDoom/GZDoom editing, but sufficient for making vanilla, limit removing, or Boom maps.
Those three are the only editors being currently developed and maintained, which means that if you run into problems with them, you can contact the developers directly.
Now, some useful links for editing help:
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Doomworld editing forum *
Dooomworld tutorial forum *
ZDoom editing forum *
ZDoom tutorial forum *
SLADE tutorials *
DoomWiki tutorials *
ZDoom Wiki tutorials *
Realm667 tutorials Don't hesitate to look at the technical information on the Doom Wiki at DoomWiki.org. There's a clone of that wiki on wikia.com, but it's not maintained by the community so there's no guarantee the info you get from there will be accurate. Always go on DoomWiki.org!
For questions on and issues with the editors:
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Latest Eureka thread *
Latest SLADE 3 thread *
SLADE 3 issue tracker *
Latest GZDoom Builder thread oh my ..! Thank you very very much so much stuff to dig in .. GZdoom builder is so interesting option.. I downloaded Brutal Doom too and I have a blast , this editor may work for the mod ( as it uses the same source ports I think )..