I do my hobby .NET development in Zed and my serious work in Rider. .NET is open source and MIT licences. I do most of my development on a ARM MacBook Pro, or using my workstation which runs Fedora.
We deploy our code on kubernetes clusters usually on AWS.
All of the tooling, compiler, libraries etc are open source and cross platform and free. Not a single one of the developers in my team uses Windows or Visual Studio.