Sven Krosse of the topicmapslab has implemented the current TMQL draft (from 2008-07-15) and his implementation has been checked into the Ontopia sandbox. It can be built with Maven (mvn package), but requires you to tell Maven where to find the current Ontopia .jar built from trunk. Once built the processor implements the same QueryProcessorIF interface as the tolog and Toma implementations, and so can be accessed from the Omnigator query plugin with some minimal configuration.
Ontopia's Blog 