The six main groups are as follows:
1. Utah Mormons: 12 Million members,
http://www.lds.org/.
2. Strangites: 300 members,
http://www.strangites.org/.
3. Bickertonites: 10,000 members,
http://the-church.org/.
4. Community of Christ (RLDS): 250,000 members,
http://cofchrist.org/.
5. Cutlerites: 40 members,
http://www.cutlerite.org/.
6. Hedrickites: 8,000 members,
http://www.churchofchrist-tl.org/.
I'm a member of the Utah Mormon and RLDS churches as well as being unofficially connected to an RLDS protest movement called the Restoration Branches Movement (
http://www.centerplace.org/). Yes, I do try to be fair to all concerned by presenting their views as I understand it as well as the objections of the other churches to the views of a specific church as well.