The three Microsoft ones (C#, VB.NET, TypeScript – PowerShell is curiously missing from the list, though) are openly developed as well. I'm not sure there are m

The three Microsoft ones (C#, VB.NET, TypeScript – PowerShell is curiously missing from the list, though) are openly developed as well. I'm not sure there are many popular open-source languages these days where the developers work behind closed doors and only throw code dumps out every now and then.