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.

PmWiki is a wiki-based system for collaborative creation and maintenance of websites. PmWiki pages look and act like normal web pages, except they have an "Edit" link that makes it easy to modify existing pages and add new pages into the website, using basic editing rules.

DokuWiki is a simple, clean and easy to use a Wiki system that allows collaborative editing of a web site. It's focused on creating documentation for developer teams, workgroups and small companies.

TWiki 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.

MediaWiki is a powerful wiki engine for web-based document collaboration - providing a mechanism for multiple people to work together in creating and editing information. It includes powerful wiki tools that allow you to create content using ‘wikitext,’ a simple plain text format that eliminates the need to write HTML code.

MoinMoin is an advanced, easy to use and extensible Wiki Engine with a large community of users. It’s written in Python and has a clean easy to understand user interface. Since it’s a Python program it’s not one of the most popular wikis, but that’s a shame as it has a very clean interface and is a very powerful tool for documentation projects. This makes the JumpBox for MoinMoin even more valuable, because it allows us to expose this great Wiki system to more users who we believe will find it quite valuable.

TikiWiki is your Groupware/Content Management System solution with a long list of features to help you build a compelling web based community.

SugarCRM is the market-leading, commercial open source customer relationship management (CRM) application. SugarCRM's open source architecture easily adapts to any business environment by offering a more flexible, cost-effective alternative than proprietary applications.

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.

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