Debian packages for PeerGuardian Linux (including the GUI) and its precessor moblock/blockcontrol/mobloquer.
PeerGuardian is a privacy oriented firewall application. It blocks connections to and from hosts specified in huge blocklists (thousands or millions of IP ranges). Its origins lie in targeting aggressive IPs while you use P2P.
See http://sourceforge.net/projects/peerguardian/
JWall is not just a javagui 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