Source code
Galactic Empire's source code was released under the GNU General Public License (GPLv2) in 2002 by Mike Murdock and posted here: https://sourceforge.net/p/gnu-ge/code/
It was moved to https://github.com/bsimser/ge in 2016 by Bill Simser and relicensed under the MIT license.
Files from source
GECMDS.C
GECYBS.C
GEDROIDS.C
GEFUNCS.C
GEGLOBAL.H
GELIB.C
GEMAIN.C
GEMAIN.H
GEPLANET.C
GEPROTO.H
GESAMPLE.C
MBMGEGRF.C
MBMGEMP.LNK
MBMGEMP.MAK
README.TXT
SECURE.C
SECURE.H