User summary:
SAGE was developed as "a very simple generic rules system, with the emphasis very much on the roleplaying". It was intended to be the driving system for at least six settings undergoing contemporaneous development (The Inner Sea Scrolls, Sands of the Mumad, Commune, Forever, The India Tea Company, and Renaissance). The game was published, though the settings apparently were not.
Characters in the game are defined by nine Characteristics divided into three groups of three, namely:
EGO - Determination, Observation, Presence
IQ - Discipline, Intellect, Knowledge
Physique - Agility, Endurance, Strength
Characteristics have a numeric value running from 0 to 4 (1 to 3 are normal), generated by random roll.
Characters select a "Path", which determines physical toughness and some resistances. There are four Paths - Will, Fatigue, Shock, and Wound. Characters also select a Career and a "Life Group", which is essentially a user-defined suite of Skills. Skills are basically narrative tags, not hard definitions.
Action resolution (including combat) uses a relatively simple colored 2d6 roll vs. target number. The roll is read as a pair, yielding a type of "percentage" result; roll "doubles" (11, 22, 33, etc.) have special effects (these are used in "Advanced" rules). Relevant skills provide an add to the first ("10s") die, relevant Characterisitcs are added to the second ("1s") die. Rules for character progression were planned but not developed.
SAGE was published in HTML format. A planned PDF version apparently was not released.