SpamCheetah is a network-level spam filtering solution built around OpenBSD greylisting, tarpit, and blacklisting. It comes with a Web interface and requires zero administration. It does not allow spam to even land in your network, thus saving you precious bandwidth. It does not have the 'false positives' problem of losing legitimate mail.
The pylib library features the popular py.test command line tool for rapidly writing and running tests in Python and py.execnet, a new way to do ad-hoc distribution of Python code to remote processes. py.test runs well on Linux, Windows, and OSX using Python 2.4 through to 2.6. It can distribute a single test run to multiple machines. It is used in many projects, ranging from running tens of thousands of tests integrated with buildbot to a few inlined tests on a command line script.
TIPP is an IP planning application for network departments of organizations with medium- to large-sized networks. While providing all the necessary functions for keeping track of your IP and network allocations, it combines simplicity of design and use with a clean and thoroughly modern look and feel.
Mettā is an OS for mobile, multimedia, and social applications. Mettā's purpose is to be easily deployable over a range of mobile and home devices, without tedious setup procedures, while allowing people to communicate easily in a very ambient way and express themselves freely by creating, modifying, and publishing text, audio, and video information in a simple way. Mettā's flexibility comes from transparent resource manipulation and transparently distributing computing tasks between nodes on the network, while maintaining data integrity and privacy.
OpMon is a network and system monitoring application based on Nagios with extended support for capacity planning, SLA, SLM, network discovery, service catalogs, report schedule, Davinci, a dashboard builder, and much more. OpMon provides a GUI for Nagios as well as full multi-language support. The license to use the opmon proprietary modules is free for 2 hosts and 20 services. OpMon comes with many open source applications like phplogcon, Nedi, ntop, nagtrap, OCSInventory, OTRS, and opcfg.