Independents go about their business as they see fit engaging in the same type of work as the other Factions, but without any true allegiance to the Empire, Selvaris, or the Rebellion. Depending on how you choose to play your character, you could be seen as a useful ally, or potential threat, or simply a neutral party.
The five main criminal organizations unified under a single unknown individual whose identity is known only by the head of each syndicate.
Though Mandalore is mostly under Imperial occupation, there are a number of independent Clans operating throughout the galaxy.
Though Jedi and Sith are the most well known, there are other Force traditions that may dare to practice despite the Empire.