It&#x27;s not obvious from the Amethyst page that it&#x27;s open source: <a href="https:&#x2F;&#x2F;github.com&#x2F;ianyh&#x2F;Amethyst" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;ianyh&#x2F;Amethyst</a> (looks to be the MIT licence)