Tversity is well known as media server software for home networks.  Tversity is a UPnP A/V and DLNA compliant media server with options for connection to Internet media streams.  Tversity can convert the media encoding on the fly to suit connected devices on the home network.

Whilst not intended to be a HbbTV application or product, there are many similarities in functionality, html5 compatibility and second screen features that it is wise to have a closer look.  For example, an older "Smart TV" which has DLNA on board but not HbbTV can still connect to various Internet streaming media sources via the Tversity server.

Consumer products:
Tversity Media Server -
Tversity Screen Server -

Commercial products:
Tversity Appflinger -
Tversity Airflinger -