When I ran Crowdsec, I thought it was a great piece of software, and a very decent free tier. I didn’t have any real complaints other that there was not a way, at the time that I knew of, to have the UI selfhosted. I think now someone has created a selfhostable user front end to it, but I haven’t dabbled in that.

Here we go: corelab.tech/crowdsec-web-ui-setup-guide/

I think this gent posted this a week or so ago.