openCollabNet (OCN) provides documentation, downloads, access to cutting-edge projects, and community-based support. Below is a listing of some of the resources CollabNet provides free of charge. Note that many of these resources require you to register for OCN.

OCN has a variety of forums/mailing lists for CollabNet products. Most forums are tailored to end users, but some forums are for developers of extensions and integrations.
Some of the most popular forums:

On OCN, you can participate in projects and collaborate with other engineers. Some of OCN's featured projects include:
More projects are started all the time, so check back to OCN for new ones.

Each CollabNet product has its corresponding resource pages on OCN, featuring links to documentation, discussion forums, blogs, SDKs and sample code. Here is a list:
User Resources - downloads, release notes, roadmaps, and more
Developer Resources - APIs, software projects, Javadocs, and more

We are gradually adding professionally developed Web-based training modules to OCN, available to registered members. Currently, we offer introductory training modules for CollabNet SourceForge Enterprise 5.0, with more on the way.