Moodle is a course management system that allows educators to create online learning communities for their students. It has an open design with a large developer community creating plugins, themes and modules. It's used all over the world in environments large and small and is one of the better supported Open Source course management systems. The JumpBox for Moodle is a great way to get up to speed with Moodle and requires a minimal investment in time and money.

Drupal is an open source, web content management (WCM) system. It provides a simple, intuitive interface that allows an individual or a community of users to easily publish, manage and organize a wide variety of content on a website without programming skills.

PunBB is a lightweight discussion forum that provides the essential features to host a thriving community without the tedious database, web server and application setup. It may have fewer bells and whistles than other forum applications but it has an intuitive user interface and renders XHTML-compliant output.

Enterprise Wiki is a flexible, powerful, and easy to use enterprise wiki, enterprise collaboration platform and knowledge management system. It is a Structured Wiki, typically used to run a project development space, a document management system, a knowledge base, or any other groupware tool, on an intranet or on the internet.

Redmine is a project management and issue tracking system for software developers. Redmine provides many of the features in Trac plus support for multiple projects, role based access control, time tracking functionality, Gantt charts, a calendar view and user self-registration support.

Joomla! is arguably the world's most popular open source content management system for public facing web sites. Joomla 1.5 is a ground-up rework of the Joomla 1.0 code base moving it to a true MVC architecture.

Trac is an advanced tool for tracking software development projects. It provides a simple wiki, issue tracking system and tight integration with the Subversion revision control system.

phpBB is the most widely used Open Source discussion forum system. With a large and highly customisable set of key features coupled with a standards compliant interface, phpBB will grow with, and compliment your website. It's a great tool for simple things like staying in touch with friends or more complex uses like a large discussion group for a corporate web site.

Drupal is an Open Source, web content management (WCM) system. It provides a simple, intuitive interface that allows an individual or a community of users to easily publish, manage and organize a wide variety of content on a website without programming skills. This JumpBox is for Drupal 6.x.

Wordpress is the leading open source blogging platform that has rocketed to popularity thanks to its open design and powerful features.