Mac users interested in Birdfont 2.1 generally download:
Birdfont is intended for creating and editing fonts. Moreover, it supports working with TrueType and PostScript curves in both color and monochrome fonts formats. The application has a modern straightforward interface. Unfortunately, although there are tutorials, they may still leave some of your questions unanswered.
Additional suggestions for Birdfont 2.1 by our robot:
Search in titles