Zeek is a powerful network analysis framework that is much different from the typical IDS you may know.
A package manager for Zeek
The default package source of the Zeek Package Manager
Zeek's Messaging Library
C++ parser generator for dissecting protocols & files.
Zeek Auxiliary Programs
A fairly quick data structure for matching a string against a large list of patterns.
Third-party code used in Zeek.
kqueue(2) compatibility library
(DEPRECATED) Bro Client Communications Library
A netmap-based packet layer for distributing and filtering traffic.