Another little thing I did. Compiling was rather painless - mostly changing __LINUX__ to __MAC__ and recovering a few files from pre-6.9 version. It looks like the format of "custom view handlers" in Hex-Rays SDK has changed between IDA 6.8 and 6.9.
So the diff is here and the (IDA 6.8) plugin is here (32bit) + here (64bit).
IMMV - I have only tested that it compiles, displays context menu and C-Tree graph.
I'll maintain a branch for IDA Pro 6.8 OS X for a brief while at https://github.com/agelastic/HexRaysCodeXplorer/tree/OSX_IDA68
