I am currently writing the dav backend for gvfs and I use apache + mod_dav for most of my my testing. I was now wondering if there is open webdav server out there that supports more features of the various webdav RFCs then mod_dav does. (E.g. ACL [RFC3744] or Redir [RFC4437]). An non-free but open server that I could use for testing would be fine as well.