To add to this, Seil [1] is free and has been available for many years. If anyone here uses it, a donation is probably a good idea.<p>[1] <a href="https:&#x2F;&#x2F;pqrs.org&#x2F;osx&#x2F;karabiner&#x2F;seil.html.en" rel="nofollow">https:&#x2F;&#x2F;pqrs.org&#x2F;osx&#x2F;karabiner&#x2F;seil.html.en</a>