Bro is not strictly an intrusion detection system that generates alerts, like Snort. Bro generates a range of NSM data, including session data, transaction data, extracted content data, statistical data, and even alerts. Bro includes an intelligence framework that facilitates integrating various sources into Bro. The Critical Stack Intel Client makes it easy to subscribe to over 30 threat feeds for the Bro intelligence framework. The output of the client will be new entries in an intel.log file, stored with other Bro logs. Please take a look at this free software and let me know what you think.”]
Source: https://taosecurity.blogspot.com/2015/01/try-critical-stack-intel-client.html