star wars - Are there organized groups of Force users other than the Jedi and Sith?

In The Force Awakens Maz Kanata says

I am no Jedi, but I know the Force.

Are there any other groups who have learned to use the Force, or is every non Jedi/Sith force sensitive completely untrained?

Answer

Between canon and Legends, there are plenty of Force user organizations. Here's a list:

http://starwars.wikia.com/wiki/Category%3AForce-based_organizations

From current Disney canon, the Dathomir Nightsisters or witches were featured in the Clone Wars cartoon series, which is considered current official canon.