Flexible open-source content management and blogging software with an active user and developer community and a wide variety of plug-ins or extensions available.
Full-featured open source office productivity suite, featuring word processor, spreadsheet, presentation, drawing and database packages; free MS Office replacement.
Social networking for non-social purposes with a focus on professional development, networking for jobs and problem solving through the expertise of those in your extended network.
The Social Source Commons is a “knowledge commons” that provides users with: a directory of software applications; links to relevant documentation, localization tools, services, user reviews; and a place to request tools/features.
FLOSS Manuals is a wiki-like platform for generating user manuals for free, libre, and open source software (FLOSS). The goal of the project is to make free software more accessible by providing clear documentation that accurately explains their purpose and use. The manuals on FLOSS Manuals are written by a community of people, who do a variety of things to keep the manuals as up to date and accurate as possible. The way in which FLOSS Manuals are written mirrors the way in which FLOSS (Free, libre open source) software itself is written: by a community who contribute to and maintain the content.