Below is the documentation available for V3 of the Shibboleth Service Provider, including all 3.x patch and minor upgrade releases. Documentation is split up in to two parts: documentation meant for individuals that are deploying and managing an Identity Provider and documentation related to building/developing it.
All software, including archived releases, is available from https://shibboleth.net/downloads/service-provider/ and each source and Windows release is accompanied by a detached PGP signature using one of the keys listed in the project's PGP_KEYS file.
All deployers need to subscribe to the Shibboleth Announcement mailing list. This is where announcements about new releases, end of life of past releases, and are distributed.