Sift
Sift is intended to parse the output of several security tools, and provide a consolidated report based upon those findings

Security

IPTables firewall configuration engine
etherdam is an IPTables firewall configuration engine; it implements a primitive (and hopefully simple) scripting language

Communications
Security
System::Networking::Firewalls

Chaosreader
Chaosreader is a freeware tool to fetch application data from snoop or tcpdump logs. Supported protocols include TCP, UDP

Security

Ada BIND
A DNS server that is secure, scalable and portable by design, Ada BIND aims to solve the issues found in other popular DNS

Communications
Internet::Name Service (DNS)
Security
System::Networking

jGuard
jGuard is written in java. his goal is to provide a security framework based on jaas (java authentication and authorization

Security
System::Systems Administration::Authentication/Directory

Authoxy authenticating proxy server
Authenticating proxy server software for Mac OS X. The front-end is written in Obj-C using the Cocoa framework, but the

Security
System::Networking

NoFault
NoFault is a library written in C used to encrypt or decrypt data with XOR encryption. KNoFault, NoFault32 and CLNoFault

Security
System::Archiving

tumbler
tumbler is a protocol and implementation that provides a stealthy and secure way to execute a predefined command on a remote

Security

TrustNet
TrustNet is a way to share trust applied to firewalls. Each port have a trust level(TL) required. Enter some of your friends

Communications::File Sharing
Internet
Security

Wumi - the WU-wien Milter
A sendmail Milter written in Python. It rejects Mail containing certain attachment filenames (.exe, .pif ..., configurable

Communications::Email::Filters
Security