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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Snort on the other hand is a real full-featured IPS and much more powerful. Using them together can offload the processing work Snort needs to do though. You can use something like pulledpork to automatically update various rulesets for Snort as well (community, Talos (Cisco), etc.). Snort is also a big part of Cisco's FirePower firewalls.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.