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Based on what I am seeing from the Keystudio website, the software you need is just the Arduino IDE. This can be downloaded from Arduino.cc for most operating systems, including Mac OSX. You may need to install support for other boards or install libraries to make it work with the Arduino and hat included with the kit.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.