Mixcore CMS - Mixcore CMS is an Open Source Enterprise ASP.NET Core / Dotnet Core CMS for building amazing digital experiences. It's made by a dedicated community. Anyone can use it, and it will always be free.
Lavalite - PHP CMS built with Laravel and Bootstrap.
CSZ CMS - Home | CSZ CMS is a content management system, to manage all content and settings on the site. This should make your website fully responsive with ease.
DEV.to - Where software engineers connect, build their resumes, and grow.
WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.
ApostropheCMS - Apostrophe is a powerful website builder platform built on an enterprise open source CMS, offering in-context live editing, visual design tools, and multisite enablement in a full stack JS environment.