lokeller

In DVB (and IPTV systems that use MPEG TS) Teletext is sent in its own pid, along with the audio and video pids of the program being watched ( for the details you can check ETSI 300 472).

vlc btw contains a decoder for teletext pages, you can tune in to a dvb stream and look at them.

Trivia: in some countries (for instance in Switzerland) subtitles for movies are sent sometimes as semitransparent teletext pages (in CH it is on page 777) even if DVB supports natively subtitles.

Some time ago I saw this one: http://www.vassalengine.org/

It has an amazing number of "modules": games implemented on it.

It is written in Java.

I like this idea very much. I did the same reasoning regarding whatsapp and the likes. Mobile messaging is another use case that can be handled pretty well with email. We just need a better UI.

To toy around with the idea I created a prototype (still far from prime time but already working): http://www.carteggio.ch