Force 9 is science fiction role playing game inspired by Alien and Starship Troopers.
I remember Ysgarth from my role playing days in the late 1970s. The game first was published in 1979. It was one of a number of fantasy rpgs that I remember we tried before finally settling on the Warhammer Fantasy Role Play.
Ysgarth has got a pretty complex system of skills and attributes, but action is resolved on a simple d100 (that is, you roll 2d10s and read them as separate decimals)
Recon, The Role Playing Game Of The Vietnam War was published in 1982 by Role Playing Games, Inc.
In this unusual free role playing game, you play a simple robot charged with defending the last human being. The Last Human is written by Nathan Russel as a part of the 24 Hour RPG Challenge.
44: A Game of Automatic Fear is a free rpg set in a 1950s where a conspiracy is replacing humanity with robots.