Telemetry is available as well ... provided you are willing to do a little coding on your own ... maybe.
Weeder Technologies has several digital/analog interfaces from which to choose. Though making use of a serial interface, they are compatible with the MacOS through the use of a serial/USB adapter. In fact, at least one enterprising individual has created a Macintosh GUI programming interface - though it appears to be designed for XTension.
There are a few other options as well. One of the newer, and more novel, are the iButtons.