I play muds since 96 which, together with tabletop/card/RPG games, are some of my hobbies. In 2006 I opened Iberia MUD, with a custom engine, and a couple years later I had a not exactly original idea of creating a graphical UI that could be fed by the same MUD engine, that could work in a large spectrum of devices (not exactly original as well) and a "wrapper/context" that could make sense could be a card game interface (now, I trust this is original).
Finally, I was able to make it work, even needing many improvements: being an hobby, moving from a good solution to an optimal one would take years, so I decided to released and spread the word right now in it's current state.
One of your cards is your character, other one is the room where you are, each NPC, PC and item are also independent cards, and one can interact with them like a tabletop game (mouse right button opens adequate context menus, for interaction).
It uses pure existent out of band protocols (MSDP), runs in a web browser and has already many usable systems, like "modern" chatting (including I3 channels), individual combat (the common hack and slash mud behaviour which, by the way, can be totally ignored while still being able to improve your character in game in a similar pace) or army combat (the current alternative to improve a character, which I find it more attractive than pure hack and slash).
There's a last resort always at hand: a terminal window that starts minimized but can be used anytime.
Rather than showing a finished piece of software that can bring and retain players in Iberia, it is more relevant if this opens a door to muds and devs give the jump to the 21st century regarding mud frontends, while maintaining the main old school way to play them.
A special thanks to Plamzi and his MUD Portal project, from which I got some ideas and even code. In my point of view, his effort was the last real push I saw in MUD community and was the trigger that made me start to materialize this idea (Imaginary Realities, Optional Realities and Stick In The MUD Podcast are great and very rich conceptual works I enjoy; the MUD Portal, in the other hand, is a concept brought into reality).