Zero One started from Plainkit, and it is built from scratch.
Front-end is based on UIkit, in our opinion the best CSS/JS framework that exists.
Kirby Autoresize plugin from Thomas Günther.
Kirby 3 Cachebuster plugin from Timo Schneider
Kirby 3 Image Clip plugin from Matthias Müller.
Kirby 3 Robots.txt plugin from Bruno Meilick.
Kirby 3 Similar plugin from Sonja Broda.
Sitemapper plugin from Kirbyzone.
Kirby Color plugin from Tim Ötting.
Less PHP maintained by Wikimedia.
Kirby 3 Commentions plugin from Sebastian Greger