(Geek Mode)
There are the Jensaari, the White Current Adepts, the Baran-Do sages, the Aing-Tii monks, as well as the 'Gray Jedi', who were sort of technically associated and trained by the Jedi, but operated outside their code and were even known to hold a more inclusive view of the force, one that would later be more common in the new jedi order era, generally referred to as the 'unified force' - a view in which the 'light' and 'dark' side are aspects of the individual's psyche and potential, rather than anything to do with the force itself.
There were dozens of other organizations as well, don't remember very many off the top of my head. Of course, this wasn't mentioned in the movies, but the process of authoring and structuring the novels relies heavily on Lucas' input (for now) and supposedly much (though not all) material relating to history, force users, and primary cannon characters is decided by lucas if only in the sense of a vague framework where authors have the ability to exercise significant creativity. In the end, there are mandates by which a book must abide in order to be 'canonized' as it were.
*ahem*
The views of these various group differ sometimes only very little and sometimes wildly. Some recognize no distinction between the light and dark side, seeing the virtue of the force in it's inherent quality of connectivity and organization. The white current adepts, for instance, are total pacifists, and see the 'dark side' as an illusion born of the individual's own inner evil, and consider this a taint of the force. They insist that the white current itself is something other than the force, that is to say, that it is a deeper aspect of the functional force, whereas the jedi, for instance, utilize a more superficial aspect.
While the movies of course remain the most widely 'impressive' and known elements of the star wars universe, the books evolve the universe to an incredible degree of detail, and in my opinion really serve more as a base of consideration than the movies themselves.
Eh, that's my piece.
peace
p.s. ah, here also, from wookiepedia:
QUOTE
Counter to millennia of Jedi teachings, the followers of Potentium claimed that there was no inherent evil in viewing the Force. They claimed that what others called the light side was actually just the Force itself, which is inherently good. This was backed up by the fact that Ashla, the ancient name of the Force, came later to describe the light side. What others therefore called the dark side was a perversion of the Force, twisted by those who used it. Believers of Potentium said that the potential for light and dark sides resided in the user, not the Force itself. They also thought that the Jedi Masters refused to believe in the Potentium view because it would mean the Jedi weren't needed to fight evil, for evil would not exist. And since there was no dark side, there were no dark side actions or Force techniques; in effect any action, good or evil, could be performed without risk as long as the intent wasn't evil. Some Jedi have theorized that the Potentium may have originated as a Sith scheme to subvert Jedi teachings.
About a century before the Battle of Naboo, the followers of Potentium were expelled from the Jedi Order, parallel to the Jedi Order's treatment of Gray Jedi as "misguided." Yoda and the rest of the Jedi Council didn't consider them Dark Jedi, but they said it was the duty of the Jedi to use the Force to protect others, not study its absolute limits. The Council said that testing the Force to its limits would lead to the dark side.
It should be noted that some followers of the Potentium still attempted to avoid the dark side--however they saw the dark side as something within themselves to be avoided, not something in the Force. They reason that if the Force is the energy that flows through all life, the darkside simply came from the corruption of humanity. They felt that if they could be perfectly moral, they could be immune to the dark side and therefore use any technique they wanted.
This post has been edited by Vagrant Dreamer: Dec 3 2008, 08:16 PM