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The only public codebase I know of which has any sort of coordinate system is Telford Tendys entry in the 16k MUD competition, which you can download from here:
Coordinate systems are not particularly difficult to code or build within - the only real difficulty lies in integrating them into an existing mud. That's why almost of the coordinate-based muds you'll see are written from scratch.
Of course there are also the room/coordinate hybrids, perhaps the most common of which are those utilising a wilderness system, with each coordinate location having a room. Those are fairly simply to add, and wilderness systems are even available in snippet form.
Then there's the "coordinate locations within a room" thing, which is the easiest to implement, but unfortunately doesn't really add much. It does provide an indication of distance within rooms, however, which can allow you to add primative ranged combat, as well as give a vague impression of varied distances within rooms.
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