We initially hoped that it would be relatively simple to support OS X, unfortunately that turned out to not be the case. The unique bits of functionality that Innkeeper provides vs HDT/etc (collection syncing and the Hearthpwn integration that enables) rely on .NET APIs that just don't work on OS X :( If I ever have a free week with nothing else going on, I'll fire up my poor ancient Macbook and try to get something working.
We still want to make a Mac version. We have no idea if or when that will be possible.
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Innkeeper developer - yup, it's probably my fault.
Is there any chance you could publicly document the API between the client and server? In lieu of a full client port, just being able to authenticate and submit collection information from other tools would be a huge help (As a Linux gamer, I'm not holding my breath for a port...)