Like Hellfire, I have been debating whether to not block IPs for synapse but to just issue a 403. I have seen a few multiple-access cases and a handfull of IPs appear to be servers, though I would not swear to that. I think it probable that I will stop blocking IPs for synapse in the near future.
As to whether or not it's the apache project: I don't know, but as noted above the UA does seem to concentrate (though not exclusively) on .GED files which it may think are XML compatible. If it is not a genuine tool but a bad bot then it may not even be annotated in normal online sources.
Arts & Letters (Graphics)
Family Historian (GEDCOM File) (which mine are)
Game Editor interactive multimedia tool (likely target, I would think)
GoldED / DOS Compiled Configuration File (another likely target?)
Micrografx Simply 3D Geometry