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Joomla is a free and open-source content management system written in PHP. The CMS is built entirely by volunteers from all over the world and has a strong community that provide educational resources, and extensions. 

WordPress powers roughly 30% of all web pages online. It's a free and open source CMS designed and developed for self-hosted publishing by Automattic, Inc. The software is written in PHP and utilize either MySQL or MariaDB as a database, and is compatible with most web hosts. Wordpress includes a plugin architecture and a templating system that can be used to extend and customize your website. These are commonly known as WordPress plugins and WordPress themes and make up a whole open source and commercial eco-system where anyone is free to create products for the platform. 

October is a free, open-source and self-hosted content management system written in PHP on top of the framework Laravel. The CMS features a universal extendable dashboard, inspector, reusable CMS components and a plugin system that can be used to extend functinality of your website. The plugin store contains thousands of community-made plugins that can either be purchased or installed for free. As a data store, October CMS supports MySQL, PostgreSQL and SQLite.

Netlify CMS is a static site generator that is based on client-side JavaScript with a reusable APIs and prebuilt Markup. Simply pull in Netlify CMS to /admin of you site and you have an SPA (Single Page Application) admin panel that can edit content stored in a Git repository. Serving applications like this, the JAMstack way, improves performance, lowers cost of scaling and provides for a better development experience.

Jekyll is a static site generator written in Ruby. With Jekyll, you can transform your plain text into static websites or blogs. No more database, and cumbersome updates and install, simply focus on your content. In Jekyll, permalinks categories, pages, posts, and custom layouts are factored into the design, so you can get started writing content, right away. For layouts and template, Jekyll uses the Liquid templating language which allow you to design and structure a site to your liking. In a nutshell Markdown, Liquid, HTML and CSS goes in, and out comes a static site ready for deployment.

With no knowledge of PHP required at all you can make any static web-page editable by your clients.