Liferay Portal would be good choice (support JSR-168 spec. & JSR 286 spec.)
Liferay Portal is the world's leading open source enterprise portal solution using the latest in
Java and Web 2.0 technologies.
* Built in Content Management System (CMS) & Collaboration Suite
* Out-of-the-box usablility�choose from over 60 portlets
* Out-of-the-box development tools
* Out-of-the-box localization to 22 languages!
* Runs on all major application servers, databases and operating systems
* Benchmarked among the most secure portal platforms
* Business-friendly MIT License