Doom Builder 64 is a modified version of Doom Builder 64 designed to create levels for Doom 64.
SLADE3 is the successor to both SLumpEd and the level editor SLADE. It has a familiar "list" interface to previous lump editing tools. It supports most of the image formats that Doom64EX can use, and can convert formats to others with ease. It also has a text recognition feature for text based scripts such as MAPINFO.