We're happy to announce the public beta of Clearspace. We've been using Clearspace in our office for a while now and a number of customers have been testing it as well. It's really exciting to see it in use, especially here at Jive. We're really taken with the blogging features.
There are two ways to try Clearspace: as a standalone server or as a WAR file you can drop in your own appserver. There is a README to check out which lists some of the known issues. We have a feedback forum set up as well, which we'll transition to a support forum when the final release is out. We'll also launch our public issue tracker soon, watch the feedback page for more details. The final version will be out soon!