As a software developer I see nothing wrong with this. Keyclone may feel differently, however if he does I'm sure he'll ask the OP to go ahead and change the name. For fucks sake, the guy hasn't even released it at this time!

As for releasing KeyClone on the Mac, it would be a complete rework and since Mac's make up about 15% of the market I would guess it wouldn't be worth learning unless you were already involved. One of the major reasons I haven't flipped to Mac (and with Parralells (SP) this reasons becoming less by the day) is that I don't want to have to run two systems at home so I can still do my work...

Anyhow, it's a slick looking mac app similar to Keyclone, which is exactly what the OP said it was... if the name offends Keyclone, he'll speak up.