Established in 1987, 3D Realms (legal name Apogee Software) is a developer and publisher, best known for the Duke Nukem series.
Bio Menace 4 is a Bio Menace mod made by szemi. It's an unofficial and independent sequel to Bio Menace 3. The story starts where Bio Menace 3 left off...
Commmander Keen in "The Adventure Begins", episode zero: Printed to Pluto is a Keen 1 mod is being made by (me) szemi.
Mort 1: Doomship Dilemma is a Keen 1 mod was originally started by Dr. Villain, but he abandoned the mod, so Szemi has finished it.