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.

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.

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.

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.

Project Pier is an Open-Source, self-hosted PHP application for managing tasks, projects and teams through an intuitive web interface. ProjectPier will help your organization communicate, collaborate and get things done Its function is similar to commercial groupware/project management products, but allows the freedom and scalability of self-hosting.

Cacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with hundreds of devices.