A simple, portable port scanner
PeerGuardian - a privacy oriented firewall application
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
upnp port opener
Network Firewall Linux Kernel Module with Conflict Resolution Engine
Open source voucher management / hotspot system
Extract and Convert Juniper Firewall Policies to CSV
download and convert ip block list
network control and reporting
Personal firewall for linux desktop and android phone
Block incoming traffic from Tor network with IPTABLES