Eureka is a Doom level (wad) editor for Unix systems running X. It is
originally derived from the Yadex editor, in turn based on the DOS editor,
DEU 5.21.  It uses the FLTK toolkit.

Eureka supports Doom alpha, Doom beta, Doom, Ultimate Doom, Doom II,
Final Doom, and Heretic. There is also limited support for Hexen and Strife.