Other than the built in functions? This is kinda the purpose of Webmin. I guess the downside is it isn’t as ‘braindead’ an interface as what you would expect in a GUI. More of a ‘helps you manage’ what’s already there.
Howdy,
OPNsense is a fork from developers of PFsense but has more features for free.
Both appliances are a little intense to get setup and configured but offer amazing protection and adaptability for inbound or outbound networking.