Primers
Want to know what plurality/multiplicity/systems are? These are good places to start. Organized in order of increasing complexity.
Some of these websites will also contain basic plural terminology. For more extensive lists, check out the Terminology page.
Morethanone - author unknown - a super basic primer on plurality for those who know basically nothing. https://morethanone.info/
A Singlet’s Guide to Plurality - by Sapphic Bouquet - a beginner-friendly informational post about plurality. https://whisperingflowers953329189.wordpress.com/2018/06/08/a-singlets-guide-to-plurality/
Plurality Playbook - by Lucia Batman and Irene Knapp - an informational guide on plurality meant to be shared with employers and coworkers. https://www.pluralpride.com/playbook
Endogenic Hub - by Hordes - a website that has some information and definitions relating to endogenic systems, and lists other resources and communities. https://endogenichub.weebly.com/
The Dissociative Initiative - by Sarah K Reece - a website that has information and resources for collectives that experience dissociation and/or amnesia, though also caters to systems in general. https://di.org.au/