Novell have released a set of Open Source Portlets that will allow you to plug content into your portals. The portlets include GroupWise Calendar and Email as well as a port of many of the old NPS Gadget portlets.
The portlets are JSR-168 compliant and will work out of the box with JBoss and Liferay. The link to the project is:
We would love to see how many different portals you can get these working in – make sure to submit your changes back to the project.