It's simply based on MegaHAL, but it's implemented as a Java package, so you can easily make use of it from your own Java programs.
The jar file also contains the source code and is only 6kb in size, so you can see how simple it is at the moment.
A few people have already started by making a PircBot use the JMegaHal package to read in large text documents and spout out random jibble!
FOAF updates: Trust rankings are now exported, making the data available to other users and websites. An external FOAF URI has been added, allowing users to link to an additional FOAF file.
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If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!