WordPress: WordPress.com powers beautiful websites for businesses, professionals, and bloggers. It lets you create beautiful and powerful websites or blogs. It is a web software you can use to create a beautiful website, blog, or app.
Drupal: Drupal is content management software. It's used to make many of the websites and applications you use every day. It has great standard features, like easy content authoring, reliable performance, and excellent security. But what sets it apart is its flexibility; modularity is one of its core principles. Its tools help you build the versatile, structured content that dynamic web experiences need.
Joomla: Joomla is a Content management system at heart and has some seriously great features that make organising and managing your content a breeze. Joomla is a free and open-source content management system (CMS) for publishing web content. It is built on a model–view–controller web application framework that can be used independently of the CMS.
ModX: MODX is the web content management platform for those that truly care about no-compromise design and exceptional user experience. It gives you complete control over your site and content, with the flexibility and scalability to adapt to your changing needs.
RefineryCMS: Refinery CMS is perfect for creating custom content manageable websites. We use "The Rails Way" where possible so you have to learn as little as possible to get started!
DotNetNuke: A Web CMS Platform That Powers Rich, Interactive Websites and Intranets. It is the leading open-source web content management platform (CMS) in the Microsoft ecosystem. The product is used to build professional looking and easy-to-use commercial websites, social intranets, community portals, or partner extranets. Containing dynamic content of all types, DNN sites are easy to deploy and update.
Umbraco: The friendly open source CMS in the cloud. With automated upgrades, unlimited hosting, and smooth deployments, it's the smarter and more productive way to build websites.