Liferay Portal Engine
Liferay is a JSR-168 compliant open source portal engine. It runs on all major application servers and operating systems. It also contains a packaged content management / collaboration suite.
Some of the key features of Liferay are,
- Complete AJAX support including drag & drop.
- Fine grained authorization model.
- Out of the box integration with JBoss to provide workflow capability.
- Speeds up portal development by providing Liferay eclipse plugin.
- Themes and layout support.