Bro IDS is not getting that much attention like Snort and Suricata. It is more of a network flow IDS and can be run happily alongside Snort for instance:
http://hackertarget.com/bro-ids-ubuntu/ article author: Joakim Wahlgren
I am a big fan of IDS integration and like to see it function here: https://urlquery.net/
polonus