AxCMS.net is a free Web Content Management System (WCMS) based entirely on Microsoft .NET and Silverlight platform that dramatically simplifies web application creation and maintenance.

Website: http://www.axcms.net/

BlogEngine.NET is an open source ASP.NET blogging project that was born out of desire for a better blog platform.

Website: http://www.dotnetblogengine.net/

With Gallery you can easily create and maintain albums of photos via an intuitive interface. Photo management includes automatic thumbnail creation, image resizing, rotation, ordering, captioning, searching and more.

Website: http://gallery.menalto.com/

Website: http://www.techinfosystems.com/products.aspx

ImpressCMS is a community developed Content Management System for easily building and maintaining a dynamic web site. Keep your web site up to date with this easy to use, secure and flexible system.

Website: http://www.impresscms.org/

JobberBase is open-source job board software that lets you setup a jobsite in minutes.

Website: http://www.jobberbase.com/

Joomla! is an award-winning content management system (CMS), which enables you to build Web sites and powerful online applications.

Website: http://www.joomla.org/

Kooboo is a flexible CMS based on ASP.NET MVC. Its JavaScript based interface, highly extensible framework and the unique concept of content inheritance bring a creative way for web development.

Website: http://www.kooboo.com/

Mayando is a full-featured photo blogging application that you can use to showcase your photos online.

Website: http://jelle.druyts.net/

MODx Evolution is the lightweight Open Source PHP content management platform. It offers complete freedom to website designers—allowing them to use any conceivable design.

Website: http://modx.com/

mojoPortal is an extensible cross platform, cross database, content management system (CMS) and web application framework written in C# ASP.NET. Includes Blogs, Forums, Calendar, Google Maps, Contact Form, Newsletter, Polls, Surveys, ecommerce & more.

Website: http://www.mojoportal.com/home

Moodle is a Learning Management System (LMS) that provides educators with tools such as resources, forums, quizzes, assignments, learning objects, surveys, polls, data collections, lessons, wikis and projects so that they can construct web-based courses about any topic and then invite students into those courses.

Website: http://moodle.org/

nopCommerce is a fully customizable shopping cart. A solution with comprehensive features that is easy to use for new online businesses, yet powerful enough for the most demanding e-commerce expert.

Website: http://www.nopcommerce.com/

OpenCart is a turn-key ready "out of the box" shopping cart solution. You simply install, select your template, add products and your ready to start accepting orders.

Website: http://www.opencart.com/

phpBB is a free online 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.

Website: http://www.phpbb.com/

ScrewTurn Wiki allows you to create, manage and share wikis. It is based on Microsoft ASP.NET 3.5 and can be extended and customized with plugins and themes.

Website: http://www.screwturn.eu/

SugarCRM's award-winning and highly extensible Sugar application offers a single system of truth for managing customer interactions across different lines of business.

Website: http://www.sugarcrm.com/crm/

TangoCMS allows you to quickly and easily create and manage an entire website. A powerful feature set, intuitive simple interface and built with security in mind - TangoCMS offers all you could need.

Website: http://tangocms.org/

Tiki can be used to create all kinds of Web applications, sites, portals, knowledge base, intranets, and extranets. It is actively developed by a very large international community.

Website: http://tiki.org/

WordPress is a web log of open source/content management system, it is also a personal publishing platform which focuses on aesthetics, web page standard and usability.

Website: http://wordpress.org/

XE is an open-source content management system like Drupal & Joomla. XE lets you build a community, corporate, personal, or e-commerce websites with ease.

Website: http://xpressengine.com/

Zen Cart is the art of e-commerce; free, user-friendly, open source shopping cart software.

Website: http://www.zen-cart.com/