Unfortunately, I no longer have access to the MacMini machine I've been connecting to build xCHM. If you need pre-compiled xCHM binaries that you can drag-and-drop to install, I will continue to create them free of charge, provided that I manage to raise enough money to buy a cheap Mac machine to work on. If you would like to donate, you can use the "Support this project button" at the bottom of any page from http://xchm.sourceforge.net. All you need is a SourceForge.net account (which is free), and a PayPal account. The minimum donation allowed by the SourceForge.net system is $5, and I need to raise about 800 EUROs for the cheapest MacMini machine available here.
This is, of course, if you prefer to have pre-built universal binaries. The source code is still available for free, and it is obviously possible to make Mac builds.