Powerful SOHO or Small-business UPnP-less routers that can be configured via TELNET can be used for Skype and other tools that require UPnP using this UPnP Proxy that handles UPnP request and response and configures the routers accordingly.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.
