snort
idstools: Snort and Suricata Rule and Event Utilities in Python (Including a Rule Update Tool)
suricata-check is a command line utility to provide feedback on Suricata rules. The tool can detect various issues including those covering syntax validity, interpretability, rule specificity, rule coverage, and efficiency.
A tool for downloading and archiving Snort and Suricata rules
PulledPork3 - A ruleset downloader for Snort3