EXO Platform
The eXo platform™ software is a powerful Open Source corporate portal and content management system. Users of the platform have a customized single point of access to the company's information system and resources. The use of a corporate portal increases productivity as it provides business information to the firm's employees, allows the exchange and management of this data, as well as the execution of critical business processes, from the web environment.

GridSphere
The GridSphere portal framework provides an open-source portlet based Web portal. GridSphere enables developers to quickly develop and package third-party portlet web applications that can be run and administered within the GridSphere portlet container. Here you will find the GridSphere portal framework available for download and documentation related to the installation and development of portlets using GridSphere.

Jakarta Pluto
Pluto is the Reference Implementation of the Java Portlet Specfication. The current version of this specification is JSR 168. Pluto serves as portlet container that implements the Portlet API and offers developers a working example platform from which they can test their portlets. Pluto's simple portal component is built only on the portlet container's and the JSR 168's requirements.

JetSpeed
Jetspeed is an Open Source implementation of an Enterprise Information Portal, using Java and XML. A portal makes network resources (applications, databases and so forth) available to end-users. The user can access the portal via a web browser, WAP-phone, pager or any other device. Jetspeed acts as the central hub where information from multiple sources are made available in an easy to use manner.

jPorta
jPorta is a fully functional portal engine built on top of the Jeenius Framework. It works with any 2.3 compilant servlet engine and comes with a number of useful gadgets.

jPortlet
jPortlet is an open-sourced implementation of a Portlet Container.

Liferay
Liferay is a portal designed to deploy portlets that adhere to the Portlet API (JSR 168). Many useful portlets are bundled with the portal (Mail, Document Library, Calendar, Message Boards, etc)

MyPersonalizer
MyPersonalizer is a research project that aims to produce a generic, adaptable J2EE-based framework for engineering "My" portals (such as my.yahoo.com), that is, portals that let users create one or more personal pages (workspaces) composed of a number of personalizable services.

OpenPortal
The OpenPortal is a framework, build to personalise sites helping us to select the relevant information. The basic idea is to allow a user to select a number of portlets to be shown on his/her personal page. A portlet can be a normal webpage, maybe of dynamic nature for example the users pop3/smtp mailbox or a news (nntp) reader. The portlet is a Java ServerPage or a Servlet and it is meant to be the entré to the rest of the application behind it.

OWASP
The Open Web Application Security Project (OWASP) is an all-volunteer group that produces free, professional-quality, open-source documentation, tools, and standards. The OWASP community facilitates conferences, local chapters, articles, papers, and message forums.