Actually FLStudio has a beta of version 12 that can run on OS X (natively -- not a port based on Wine, although it had that too previously). It will be released sometime soon they say, mid-late 2016 or early 2017 is my guess.

But apart from that, you can do the same things (although less builtin tooling for electronic music, but still enough) with Garageband, and, if you don't have invested in VSTs/AUs, Reason.