Modernizr is a JavaScript library which is designed to detect HTML5 and CSS3 features in various browsers, which lets JavaScript avoid using unimplemented features or use a workaround such as a shim to emulate them.

MooTools is a collection of JavaScript utilities designed for the intermediate to advanced JavaScript developer.

Socket.IO is a JavaScript library for realtime web applications. It enables realtime, bi-directional communication between web clients and servers.

Joose is a complete modern object system for JavaScript based on concepts from many programming languages such as Ruby, Smalltalk, Perl and, well, JavaScript.

Tiki is a CMS/Groupware which offers a large number of features "out-of-the-box" arguably more than any other Open Source Web Application. It can be overwhelming, even to an experienced user or administrator.

Wakanda is a JavaScript platform to develop and run web or mobile apps.

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

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

Hippo CMS is an open-source, dual licensed, Content Management System.

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

XWiki is a free wiki software platform written in Java with a design emphasis on extensibility.

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

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

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

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.