SabreDAV allows you to easily add WebDAV support to a PHP application SabreDAV is meant to cover the entire standard, and attempts to allow integration using an easy to understand API. Feature list: * Fully WebDAV compliant * Supports Windows XP, Windows Vista, Mac OS/X, DavFSv2, Cadaver, Netdrive, Open Office, and probably more. * Passing all Litmus tests. * Supporting class 1, 2 and 3 Webdav servers. * Locking support. * Custom property support. * CalDAV (tested with Evolution, iCal, iPhone and Lightning). * CardDAV (tested with OS/X addressbook, the iOS addressbook and Evolution). * Over 97% unittest code coverage. Supported RFC's: * RFC2617: Basic/Digest auth. * RFC2518: First WebDAV spec. * RFC3744: ACL (some features missing). * RFC4709: DavMount. * RFC4791: CalDAV. * RFC4918: WebDAV revision. * RFC5397: current-user-principal. * RFC5689: Extended MKCOL. * RFC6352: CardDAV * draft-daboo-carddav-directory-gateway: CardDAV directory gateway * CalDAV ctag, CalDAV-proxy.