I would not suggest the deprogrammed wiki, lots of miss information there, but there is some true stuff there too. Just wanted to add that! 
Survive’s page on ritual abuse
General information, does not include information about mind control. Aimed at survivors and allies.
BRISSC’s page on ritual abuse
General information, does not include information about mind control. Aimed at survivors and allies.
RAMCOA Resources Carrd
A very thorough resource on RA and mind control. Contains information on different types of programmed alters and their terms, a general definition of ritual abuse and TBMC, common trigger dates for survivors, and what you can do to help. Aimed at allies. The information here can possibly be triggering if you are a survivor or suspect you are a survivor.
endritualabuse.org
A vast site on ritual abuse and mind control, created by a psychologist who has worked with survivors of RA. Contains information, words from survivors to survivors, and symptom lists of survivors, mostly intended for therapists and professionals. As a survivor, I have found many helpful things for recovery on this site, but please be careful on which articles you read. The information part of this site is very thorough and can possibly be triggering if you are a survivor or suspect you are a survivor.
Deprogram Wiki
This is a site that is a gold mine for information on detecting if someone is a victim of TBMC and programming, the different types of programmed alters, and, specifically for therapists or professionals, how to deprogram someone who has been a victim of RAMCOA. HEAVY TRIGGER WARNING — this site is NOT intended for survivors at all and can be extremely triggering.
*RAMCOA - an acronym that stands for Ritual Abuse, Mind Control, and Organized Abuse.