Netlify CMS – React, needs static site gen, Content lives in Git repo.
Contenta CMS – API-First Drupal distribution with multiple Possibilities/Setups: React + Next / JSON API / static site gen / GraphQL / Ember JS / Angular / gatsby / …
Commercial/ Hosted
Appernetic – Pay what you want, Very basic, but sympathic "product". Worth a look.
Payload CMS - NodeJS, self-hosted, code-first configuration, REST/GraphQL, auth, localization, TypeScript. Free personal plan and affordable business plans.
Squidex – Ok pricing, Event sourcing: Full history + event handlers on everything, allows for custom/ self-hosted DB. Transparent roadmap provided to the public. AD/ SSO Integration upcoming.
Kentico Cloud – Hefty pricing already for 10 users. Free plan currently incl. 3 users. 15 users are above anything and then there still is the Enterprise & "contact us" plan left.
Agility CMS – So far the craziest pricing seen … for the least users per plan.
Zesty.io – Hefty pricing, no VCS, proprietary platform that looks fresh, but seems to have an old school, enterprise sales dept. in the background.
Mentions
Prose – Editor for Content on GitHub: Host your website on GitHub Pages for free, or set up your own GitHub webhook server.
Frontastic – Frontend As A Service … "Aschendorff NEXT acquires a 6-digit Euro stake in Frontastic as part of a seed investment." … interesting? Not sure… has a nice logo.