Download of nanoKONTROL 1.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. NanoKONTROL for Mac is included in Audio & Video Tools. This free Mac application was originally designed by Korg UK. We recommend checking the downloaded files with any free antivirus.
From the developer:
The nanoKONTROL features a plethora of controllers to help you get the most control out of your software for the size and money. nanoKONTROL offers nine faders, nine knobs, 18 switches and a full transport section. For each of the four programmable scenes the nanoKONTROL offers, you can set the controllers any way you need them.
You may want to check out more software for Mac, such as Bluetooth MIDI Connect, which might be related to nanoKONTROL.