An open source Q&A(question and answer) eco-system

stackoverflow-like app written in ruby, mongomapper and mongodb Question answer script.

Features include an integrated payment system with PayPal, link validation, SEO urls, unlimited categories and subcategories, reciprocal linking, link editor, template driven system compatible with phpLD templates and many more

Php weby free link directory script is licensed under GNU GPL license.

Meeplace is a Business Review CMS (Content Management System) that you can download, install, and use to create your own review site. Not only does Meeplace provide easy solution software that allows your visitors to submit their own reviews on businesses, cars, movies, or whatever content you have listed on your site, it is also a great way for your visitors to talk about their own personal experiences with companies, car dealerships, or even the local handyman. Use Meeplace to start your own business review site, product evaluation site, or directory site in minutes. You can feel secure knowing our code is not outsourced and everything is created internally by our company.

Eventicus is a social event community

Arfooo Directory is an open source software distributed free under the Creative Commons Licence.

DokuWiki is a simple to use Wiki aimed at the documentation needs of a small company. It works on plain text files and thus needs no database.