Ceefax, now in Minecraft! OpenTeletext is a teletext-like program for OpenComputers.
Networked
OpenTeletext has an in-depth networking protocol that lets clients and stations really interact. Edit pages on stations in-game and see them appear on your listeners' computers.
Lightweight
OpenTeletext is incredibly lightweight. It can comfortably run on even a low-end Tier 2 computer. This means that teletext screens can be mass-produced cheaply for billboards, or that everyone in your server can get the same service.
Decentralised
OpenTeletext is fully decentralised. There is no single point of failure, no single person in control. Clients and stations are completely independent. This makes it good for things such as geopolitical servers where connections may be tightly controlled.