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An open source, web content management (WCM) system.

TaskJuggler is a modern and powerful, Open Source project management tool.

Drupal.org is the official website of Drupal, an open source content management

Globetrotter - The first open-source guestmap.

DT Centrepiece is a free open-source content management system

FullXML is an open source ASP/XML Portal and Content Management System.

This is an open source Common Lisp implementation supporting a number of platform

A free, open source, "on-the-fly" (OTFE) transparent disk encryption program.

Free, open source, easy to use .NET Component for signing and so on

NSIS (Nullsoft Scriptable Install System) is a professional open source system to create Windows installers.