Linda was a system created by the Linda Group at Yale which explored distributed computing. Their work is described in the book Mirror Worlds* by David Gelernter*.
Scientific Computing Associates* sells a form of commercial Linda -- they even have a version for Mac OS X*.
The JXTA* folks are working on Jxtaspaces while the Java* folks work on Javaspaces, which seems to be popular with the Jini* people. (What a mess!)
IBM* has built a TupleSpace* system in Java* they call TSpaces.
Antony Rowstron* of Microsoft Research* has done a lot of interesting work in advancing TupleSpaces. I'm not surprised to see he's working on P2P* infrastructure system now. It's called PASTRY. It seems very much like Chord* and the like, but probably not as scalable.
PageSpaces is building active webpages using Linda-style "coordination languages".
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