Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
VuePress - A static site generator by Vue.js 🛠️
ClassicPress - The WordPress fork. No Gutenberg. Great future!
Portfolio CMS - Portfolio CMS is an open-source, highly customized blog and CMS written in Redux and Rails API.
Textpattern - Textpattern is an elegant content management system that is free, open source software.
DEV.to - Where software engineers connect, build their resumes, and grow.