Smoothwall Firewall - Open Source Firewalls

Smoothwall is a Linux distribution designed to be used as an open source firewall. Designed for ease of use, Smoothwall is configured via a web-based GUI, and requires little or no knowledge of Linux to install or use. Smoothwall is also a private software company based in the UK that develops firewall and web content filtering software, and which also maintains the  SmoothWall open source project.

MediaWiki - Open Source Wiki

MediaWiki is a open source wiki package written in PHP, originally for use on Wikipedia. Developed by the Wikimedia Foundation and others, it is used to run all of the Foundation’s projects, including Wikipedia, Wiktionary and Wiki news. Numerous other wikis around the world also use it to power their websites. It is written in the PHP programming language and uses a backend database. The software's code is structured functionally. The software is optimized to correctly and efficiently handle projects of all sizes, including the largest wikis, which can have terabytes of content and hundreds of thousands of hits per second. Because Wikipedia is one of the world's largest websites, achieving scalability through multiple layers of caching and database replication has also been a major concern for developers. Wikipedia and other Wikimedia projects continue to define a large part of the requirement set for Media Wiki.

Vuze - Open Source BitTorrent Client

The Vuze Bittorrent Client is an open source end-to-end application for all your torrent needs. Although it is a complete bittorrent downloader, Vuze maintains a lightweight footprint, doesn't slow your computer down, and quickly downloads torrents.

SAGE

Open Source Mathematics Software

SAGE can be used for studying a wide variety of mathematics, including algebra, calculus, number theory, graph theory and more. It is used as an open source alternative to many commercial mathematics programs, including Magma, Maple, Mathematica and MATLAB.

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