Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Tapas - Tapas – Comic, Novel and Stories is free to use digital comic application by Tapas Media that puts tens of thousands of comics and web novel on your mobile device.
ClassicPress - The WordPress fork. No Gutenberg. Great future!
Piperka - Webcomics listing and subscription manager
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
webcomic.app - Create a website for your webcomic.