Fireflier is a firewall tool, which is built on top of the iptables framework. You can create rules based on single incoming network packets or simply allow/deny single packets to pass. This project is discontinued. (see homepage)
PfPro is a "fat" client for managing configurations for PF-based firewalls. It is a graphical client-side application for managing multiple firewall configurations.
JWall is not just a java gui for iptables. JWall is a multi firewall management client. A secure rulebase can be built with graphical objects. Rulesets can be pushed to remote firewalls (via ssh). The remote firewall just needs to be Linux with sshd
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OSA::net project main goal is to create an extensible, scalable framework for management of security related devices in middle-sized and large computer networks.