Echo is a standalone JavaScript lazy-loading image micro-library.

React (sometimes styled React.js or ReactJS) is a JavaScript library[2] for building user interfaces.

Grav is a Fast, Simple, and Flexible file-based Web-platform. Although Grav follows principles similar to other flat-file CMS platforms, it has a different design philosophy than most. The underlying architecture of Grav is built using well established and best-in-class technologies.

Magento is an Open Source ecommerce web application launched on March 31, 2008. It was created by Varien, building on components of the Zend Framework.

Zend Framework (ZF) is an open source, object-oriented web application framework.

SproutCore is an open-source JavaScript web framework.

Drupal is an open-source platform and content management system for building dynamic web sites offering a broad range of features and services including user administration, publishing workflow, discussion capabilities, news aggregation, metadata functionalities using controlled vocabularies and XML publishing for content sharing purposes.

SiteCake is a drag and drop CMS for simple websites. It lets you publish the content just by dragging it to your web page. It's CMS for static websites, with few pages only, to cover the niche below WordPress level of complexity.

Fusebox is a web application framework for CFML and PHP.

Ametys is a free and open source content management system (CMS) written in Java.

OpenCms is an open source content management system written in Java.

eXo Platform is an open source, standard-based, Enterprise Social Collaboration Platform written in Java.

Liferay makes software that helps companies create digital experiences on web, mobile and connected devices.

SmartClient is set of mobile and cross-browser HTML5 UI components combined with a Java-based Ajax framework, created by Isomorphic Software to build business web applications.

OpenKM is a Free/Libre document management system that provides a web interface for managing arbitrary files.

Private JVM hosting with pre-installed Tomcat server.

dotCMS is an open source content management system (CMS) written in Java for managing content and content driven sites and applications.

Google Web Toolkit, or GWT Web Toolkit, is an open source set of tools that allows web developers to create and maintain complex JavaScript front-end applications in Java.

Apache Roller is a Java-based Open Source "full-featured, Multi-blog, Multi-user, and group-blog server suitable for blog sites large and small".