What is Liferay Portal?

1. Liferay Portal is the world's leading open source enterprise portal solution using the latest in Java and Web 2.0 technologies.  
2. Runs on all major application servers & servlet containers, 
3. databases, and operating systems with over 700 deployment combinations  
4. JSR 168 and JSR 286 compliant  
5. Out-of-the-box usability with over 60 portlets pre-bundled  
6. Built-in Content Management System (CMS)  
7. Built-in Collaboration suite  
8. Personalized pages for all users 
9. Hot-Deployable Theme/Portlet Architecture with Online Software Catalog 
10. Freeform / WebOS layout 
11. Just-in-time Portlet rendering 
12. Fine-grained permissions system