iphpchains
PHP front-end to generic TCP/IP packet filter configuration

Security
System::Networking::Firewalls

Junto
Junto is a Java-based peer-to-peer framework which allows using, simulating, and testing different trust management models

Internet
Security
Sociology

NetSentinel The Network Traffic Monitor
sentinel is a network traffic monitor. You can monitor specific packets to/from network interfaces, internet protocol addresses

Security
System::Logging
System::Networking::Monitoring

DMNeoblade`s easy PHP scripts

Security

warns of SMTP activity
warnsmtpd provides a warning message to the desktop of the user about SMTP activity. Would that activity be a result of

Security

Vuurmuur
A frontend to netfilter/iptables aimed at systemadministrators who do understand the basics of managing a firewall, but

Security
System::Networking::Firewalls

libpkix
The purpose of the libpkix library is to provide a widely useful C library for building and validating chains of X.509 certificates

Security

bernzspaces
A collection of utilities in various languages for password doing distributed password cracking including: Javaspaces, MPI

Security

acl-trend
IDS via ACL log management, including basic reporting via PHP

Database::Front-Ends
Internet::Log Analysis
Internet::WWW/HTTP::Dynamic Content
Security
System::Logging
System::Systems Administration

Net-SAM
It is a network simulator, analyzer & manager capable of simulating various fixed Internet, Wireless LANs, GPRS Networks

Security
System::Networking::Monitoring