XWE
From ZDoom Wiki
XWE (eXtendable Wad Editor) is a program developed by Csabo, that allows you to create and edit WAD files for Doom, Hexen, etc.
Current Program Errors
XWE 1.15 has a problem with importing big sprites.
Here is the response by Csabo (copied from the Doomworld Forum):
try the latest beta : http://ca.geocities.com/xwe@rogers.com/xwe_beta.zip.
I'm not sure what went wrong with the sprites. With flats, we had an issue:
any 64x64 image that was imported became a Doom Image (not a Doom Flat, which
is a different format). So you had to click Image|Save as Doom Flat. However,
now there's a much simpler way: Double-click the FLOORS button in the lower
toolbar, and select all your flats. They are imported in the right format,
and they automatically go into the right section of your WAD file. Also the
FF_START/FF_END markers are created if needed.
But to avoid all that you could use SLumpEd as an alternative. However, SLumpEd seems to support zdoom only.

