Atomic Red Team - Atomic Red Team™ is a library of simple tests that every security team can execute to test their defenses. Tests are focused, have few dependencies, and are defined in a structured format that can be used by automation frameworks.
EnterprisePurpleTeaming - Purple Team Resources for Enterprise Purple Teaming: An Exploratory Qualitative Study. Doctor of Science Cybersecurity at Marymount University Dissertation by Xena Olsen.
RE:TERNAL - RE:TERNAL is a centralised purple team simulation platform. Reternal uses agents installed on a simulation network to execute various known red-teaming techniques in order to test blue-teaming capabilities.