As /u/transhumanist2000 said, the only other one I've seen that looked heavily supported and had a sizable following are dot net nuke, and I'd add, Umbraco (https://umbraco.com/). Unfortunately I haven't heard the best of feedback about these cmses. Source: over 1 year ago

I really like Umbraco (https://umbraco.com/), It has a decent community, and is on DotNetCore these days makes it very easy to use. You can setup most basic things yourself, but since it exists as a satellite to your site. You can integrate with it as deeply or not as you want. Plus the workflow for defining content is nice, the customer-facing UI is also slick, and adding custom elements to it and extending is... Source: almost 2 years ago

Because of this, the Umbraco HQ created the Umbraco Heartcore project that builds upon the existing Umbraco CMS by adding a headless integration in GraphQL. The only problem with this solution is the pricing. Because Umbraco CMS is open-source and free to use, you might see this product solution as a barrier to entry. It also makes it impossible to use your infrastructure to manage your CMS as they require the... - Source: dev.to / over 2 years ago

Umbraco is the one I was thinking of in terms of popularity and being free and open (the self hosted version at least, they have a paid for cloud solution as well). Source: over 2 years ago

I work for an open source .NET CMS Umbraco and I wanted to investigate the snazzy new feature of GitHub Codespaces and VSCode remote container development. - Source: dev.to / over 3 years ago

Maybe worth taking a look at Bolt https://boltcms.io/. Source: about 1 year ago

Another usecase are Framework based CMS System. Beside Drupal, Typo3 using example Symfony components, still are not Full Stack Symfony and don't use Symfony based folder structure and are so very different then using Symfony Full Stack based CMS. In this area other CMS like Sulu, Bolt, .. Are placed which do not hide Symfony Full Stack and are more for the web applications which are not typical just a Website but... Source: over 1 year ago

Since I use Hugo I have no interest in a CMS myself (I only develop for myself and not for third parties). But before Hugo I had used https://boltcms.io. Source: almost 2 years ago

I have heard good things about https://boltcms.io/. Source: about 2 years ago

PHP Headless Or you go with a Headless PHP CMS. Some options for that are Bolt CMS, Suru, Twill and ExpressionEngine. A Headless CMS doesn't have any frontend. It can provide you with a REST API or you create it in their template engine and integrate your JS stuff there. There are so many, I can't count them all. You can also search for Cockpit and Strapi. Source: about 2 years ago