Hi,
I just shared the code for a Kraken plugin.

https://github.com/vinsom68/Zorro-Kraken-Plugin

There is also a compiled dll and instructions.
There are a few issues, expecially for pairs who have many decimals described in the readme.
This is the first plugin of this kind for Zorro, and it might need some updates to be fully compatible with crypto.

Use at your own risk.
This is the first version, and there might be bugs.
Mostly tested with Bitcoin as base currency, but other currencies might be experimented.

I will work next on a plugin for Bittrex, as I'm mostly trading on this exchange now.

Enjoy
Vincenzo