The Alliance of Four Great Races was an intergalactic alliance composed of the most advanced races known at that time: the Ancients, the Asgard, the Furlings, and the Nox. They would periodically meet to discuss matters of mutual concern and importance. To ensure universal communication, they created a "universal language" composed of representations of the primary elements.
The Alliance appears to have dissolved after the last remaining Ancients disappeared, and while it is unknown if the other three races still interacted with each other on some level after their passing, it is likely. With the extinction of the Asgard, only the Nox and Furlings remain. However, before their mass suicide, the Asgard proclaimed the Tau'ri as the Fifth Race of the Great Alliance. (SG1: "The Torment of Tantalus", "The Fifth Race", "Unending")
- In Stargate Worlds it would have been revealed, that each species had constructed a potential caretaker species to continue their legacy after they were gone. The Ancients created the humans while the Furlings created the Goa'uld. The Asgard creation, called "Solacris", spectacularly backfired, eventually resulting in the dissolution of the Alliance.