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crowdsec
CrowdSec - the open-source and participative security solution offering crowdsourced protection against malicious IPs and access to the most advanced real-world CTI.
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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.
You can even use sslh to run ssh on the same ports as the webserver, so http/https requests are served by the webserver, but an ssh client is connected to the ssh server.... means you can have fewer exposed ports.
I would suggest CrowdSec as an alternative to f2b. CrowdSec started out as a modern version of f2b but ended up being so much more.
NOTE:
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Hence, a higher number means a more popular project.