Evergreen

Evergreen is an open source ILS.

Authentication

Authentication can be handled two ways: either with a SIP integration (Evergreen SIP documentation) or through OpenSRF. Both techniques assume that patrons are authenticated with username and password.

It looks like the open-ils.auth service can give a yes-no answer given username and password.

Patron record

A patron record can be fetched through SIP.

Presumably the open-ils.actor service can give more detailed information about a patron, but I can't find documentation on it.