To the best of my knowledge there is no third party software that works with the Nevo hardware.

The PDAwin software will work with the IrDA emitter but you will find the range disappointing. PDAwin has not found a way to support the PDA-ir CF extender on the H39xx or later iPAQs.

The only other choice I know of at this time is TotalRemote. I'm not familiar with their software but believe they have a demo version you can try using the IrDA emitter. I do not think their software will work with the Nevo hardware either but their little emitter should work with your iPAQ.