OpenSolaris Source Juicer is a web service which allows OpenSolaris community developers to build packages and publish them for review. It is the gateway to the Opensolaris /pending and /contrib respositories. Here is a list of the packages which have been promoted to /contrib from Source Juicer. To learn more about Source Juicer you can visit the project page.
To summarize, OpenSolaris Source Juicer requires you to submit a spec file and a copyright file along with other files which are necessary to build your package. When these requirements are met, Source Juicer attempts to build a package based on your spec file and publish the resulting package into a /pending repository, where it will be assessed by Approvers. Upon successful completion of review and approval, the package can be promoted into the /contrib repo and made available to the Opensolaris community, as a trusted package. It is also possible to submit a spec file which updates the versions of packages which were previously published to the /pending or /contrib repository.
If you would like to start using Source Juicer, you should read the Source Juicer Howto help page. The Source Juicer video demo page is a good place to look for tutorials which demonstrate typical Source Juicer usage.