RendezvousProxy is an application that allows you to proxy Rendezvous/mDNS/Zeroconf service announcements across subnets.
Alternatively it can be used to create Rendezvous/mDNS/Zeroconf service announcements for services that do not have this functionality built-in, e.g. a user could announce a Rendezvous service for a corporate Web server, which would automatically appear in the Rendezvous bookmarks in the Safari Web browser.