Umbraco started around 2000 and became open source around 2004; it’s written in C# and focused on running on Microsoft’s .NET platform. It has grown into a CMS used by hundreds of thousands of websites worldwide and benefits from active community engagement.

What makes Umbraco enjoyable is that it combines two things: an editor-friendly experience - where content management is simple and visual - and developer-friendliness for those who want full control over code, structure, and integrations. With modern versions (on ASP.NET Core) you can run it on Windows, Linux, or macOS and even build headless solutions if desired.

If you’re considering a CMS where designers, editors, and developers can all be productive - and where you aren’t locked into pre-made templates - Umbraco is a solid option. The active community also means plenty of support and plugins to explore.