Does anyone know of any good firewalls for macOS? The built in firewall is practically unusable, and if client isolation can be bypassed, the local firewall is more important than ever.

I often have a dev server running bound to 0.0.0.0 as it makes debugging easy at home on the LAN, but then if I connect to a public WiFi I want to know that I am secure and the ports are closed. "Block all incoming connections" on macOS has failed me before when I've tested it.