[sieep]

From my understanding, .NET, C# F# are all open source. The main thing in the tool chain that isnt is Visual Studio but most people can get by with VS Code

[adabyron]

Highly recommend using JetBrains Rider instead if you want the best IDE experience. It's not a Microsoft product & is used by a large percentage of .NET devs.

[sieep]

You are correct to mention that especially since theyve eased up on their licensing recently, I had in mind that it was still paid for software like Visual Studio. Rider is much better for .NET than VS code!

[estimator7292]

There's also mono

[sieep]

yes a key part of the ecosystem! Roslyn is open source as well IIRC

[dlahoda]

vs code plugin is not free and opensource