Hi does jMonkeyEngine support loading of Quake/CounterStrike (1.6) BSP files and MDL models? Or are there at least a converter to Ogre Meshes?
In short, no
However it is probably possible to write such a loader, depends on how good documented the bsp / mdl / vmf / vtx format is.
For bsp and vtx this is probably a quite good possible task, for mdl I cannot say