All games by SPI unless otherwise noted (I have in all cases identified the main designer as could be deduced from the credits, though in some cases, another person might have been the de facto main designer. In some cases, listing two persons seemed necessary from the credit information.)

Battlefleet: Mars: Space Combat in the 21st Century
Main Designers: Brad E. Hessel/Redmond A. Simonsen, 1977

Titan Strike! Battle for the Moon of Saturn
Main Designer: Phil Kosnett, 1979

StarForce 'Alpha Centauri': Interstellar Conflict in the 25th Century
Main Designer: Redmond A. Simonsen, 1974

StarSoldier: Tactical Warfare in the 25th Century
Main Designer: Tom Walczyk, 1977

UNIVERSE: The Role-Playing Game of the Future
Main Designer: John H. Butterfield New York: Bantam Books/Simulations Publications, Inc., 1982 ("New 2d Edition")
The broad UNIVERSE background is too dissimilar to be inte(yrated into the elaborated SPI future-history, although the three alien races, which never officially made an appearance in print - the sht'kl'p (shape-shifters); "a race of lupine carnivores with strong family ties"; and "a race of symbionts" - could easily appear at sometime, in a diverse galaxy of the future. Many of the technological devices are generic to conventional medium-term future-history scenarios.

DeltaVee: Tactical Space Combat System for UNIVERSE, The Role-Playing Game of the Future
Main Designer: John H. Butterfield, 1981
DeltaVee concerns largely what could be called "small-fighter combat" under strictly Newtonian conditions. This kind of combat could easily occur as an adjunct to the fighting at almost any period in the future-history.

Vector 3: Tactical Space Combat in Three Dimensions
Main Designer: Greg Costikyan, 1979

WorldKiller: The Game of Planetary Assault
Main Designer: Redmond A. Simonsen, 1980

StarGate: The Final Space Battle for Galactic Freedom
Main Designer: John H. Butterfield, 1979

Outreach:The Conquest of the Galaxy, 3000 AD
Main Designer: Irad B. Hardy, 1976
The background to Outreach posited in the game itself, is deliberately open-ended and purposefully left vague (apart from the fact that the technology is a continuation of that of StarForce). However, given the vagueness and the enormous scale, other kinds of faster-than-light (FTL) travel could easily be envisioned as taking place.

More Future-History of SPI

Introduction
List of Relevant Games
The Time Line
Issues About the Star Force Background

The Near-Future History of SPI After the Holocaust