phpBB is a free flat-forum bulletin board software solution that can be used to stay in touch with a group of people or can power your entire website. With an extensive database of user-created modifications and styles database containing hundreds of style and image packages to customise your board, you can create a very unique forum in minutes.
License: GPL
Written in: PHP
Operating system: Cross-platform
DotNetNuke is the leading Web Content Management Platform for Microsoft .NET. DotNetNuke can be used as a web content management system (CMS) for simple web sites or as a powerful application development framework which enables businesses to quickly build and deploy feature-rich, interactive web sites and applications in Microsoft .NET.
License: BSD
Written in: ASP.NET/VB.NET
Operating system: ASP.NET / Microsoft Windows / SQL Server
Joomla is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications. Many aspects, including its ease-of-use and extensibility, have made Joomla the most popular Web site software available. Best of all, Joomla is an open source solution that is freely available to everyone.
License: GPL
Written in: PHP
Operating system: Cross-platform
Drupal is a free software package that allows an individual, a community of users, or an enterprise to easily publish, manage and organize a wide variety of content on a website.
License: GPL
Written in: PHP
Operating system: Cross-platform
