WaterRoof is an IPFW Firewall frontend.

Features:

• uses Mac OS X built-in IPFW firewall. No kernel modules, no extensions, no pain. WaterRoof is free and open-source
• the most advanced Mac OS X free graphic frontend for ipfw now features a new, clean interface. WaterRoof lets you create, modify, delete, move ipfw ipv4 and ipv6 rules very quickly.
• build ipfw rules easily with the new simplified interface and the IPFW Rules Translator. Building ipfw rules now is easier than ever
• Backup and deploy firewall rules with WaterRoof Injectors
• Import and export firewall configurations
• Quick dns reverse and whois queries with copy/paste
• manage network bandwidth with dummynet pipes and queues (10.5)
• check live dynamic rules created by stateful firewall rules
• watch and parse firewall logs, create raw and graphic statistics
• look at active network connections, block them or limit their bandwidth on-the-fly with the new fast connection inspector
• list all processes that make network connections
• manage Network Address Translation (NAT) daemon: create a dual-homed firewall/nat/router with port redirection and forwarding; deploy NAT settings using WaterRoof Injectors
• import rules from NoobProof Injectors
• keep your favourite firewall rules active at system boot
• explore and test ipfw with configuration wizard and ready rule sets

Requirements:
OS X 10.5 - 10.8
Universal Binary