Growing article, with links to many related topics. Wikipedia.

Official center for Sun Microsystems' open-source project. Wide range of information, services: documents, code, projects, contacts, fora, communities, programmer support.

An operating System combining the OpenSolaris kernel with GNU application userland. Site includes downloads, documentation, community support, how to get involved, list of sponsors, and a package repository.

OpenSolaris news, links, downloads: distribution (BeleniX liveCD), Nexenta OS (GNU/Solaris), SchilliX.

Custom OpenSolaris technology; over a decade experience building Solaris and Linux systems, pioneered GNU/OpenSolaris: integration of OpenSolaris (SunOS kernel) and Open Source Software (OSS) programs. California, USA.