I use a CM15A. I was looking for something that would use the CM15A (since I had a couple, one of which modified for improved RF), would run on an embedded type system (Android, embedded Windows, RPi, etc), and must include a real programming interface (no more of the AHP style "programming"). I initially looked at Domoticz, HomeSeer, etc, but they didn't really have everything I wanted.
- runs on Windows, Linux, Mac, etc (anything that can run Mono)
- can use CM11 or CM15 (and I think one more)
- multiple systems so you can combine different technologies seamlessly (X10, Z-Wave, Insteon, etc)
- can be programmed with a simple Wizard language (similar to AHP's linear style programming) or in any of several standard languages (C#, Python, etc)
- has a free Android app which I use but a new paid app which is apparently much better is new within the last couple months
- has a really good/active forum
- open source so the source can be tweaked and recompiled if needed (i.e., add a new technology interface)
I've had a few issues over the last couple years but have been pretty happy with the author's help. He has either solved or pointed me in the right direction for pretty much all issues I've had and they have been resolved.