I work with asp.net web api and angular (typescript) but I think the point stands. > Which of their former good selling products has microsoft open sourced? N

I work with asp.net web api and angular (typescript) but I think the point stands. > Which of their former good selling products has microsoft open sourced? Neither Visual Studio Code nor .NET core fits this criteria. Visual Studio IDE is not free and open source and neither is the older version of .NET framework. Launch a .NET core application inside visual studio code. Even that comes with a warning saying you can only use the debugger within certain limited situations.