OSSEM

"Define and share a common data model in order to improve the data standardization and transformation of security event logs"

https://github.com/OTRF/OSSEM

DeTT&CT

"DeTT&CT aims to assist blue teams in using ATT&CK to score and compare data log source quality, visibility coverage, detection coverage and threat actor behaviours."

https://github.com/rabobank-cdc/DeTTECT

What to Log

"What2Log was a project that began when we saw a noticeable gap in computer security notation in regards to logs. There had not been a centralized resource of what and how to understand the logs of the major operating systems that are used everyday. What2Log was made to fill that exact gap."

https://what2log.com/