One Must Fall: 2097, developed by Diversions Entertainment and published by Epic MegaGames in 1994, is set in the future where fighting between humans is outlawed. Of course, humans being who they are, need a way to fight each other.
MechWarrior 2: 31st Century Combat is a 3D vehicle combat sim game created by Activision and released in 1995 for MS-DOS. It was ported later to Windows and Mac, in addition to the console versions released in 1997.
Thexder is a platform shooter videogame developed by Game Arts and released for DOS, Amiga, Apple II, MSX and several other platforms in 1987. You control a robot that is able to transform into a jet.
MechWarrior is a vehicle simulation game developed by Dynamix and published by Activision. The title was created in 1989 for DOS but was later ported to Sharp X68000 in 1992 and PC-98 home in 1993.