This is massive and as a die-hard Linux dude it fills me with great joy to see this. TypeScript, vscode, and dotnet/core are my bread and butter and I couldn't be happier.
I work in a .Net shop and witnessing everybody (slowly) move towards this middle-ground between .Net and Linux stacks is like watching history in the making.
https://github.com/Xamarin
https://github.com/PowerBI
https://github.com/MicrosoftEdge
https://github.com/yammer
https://github.com/OneDrive
https://github.com/MicrosoftResearch
https://github.com/LIS
https://github.com/DynamicsCRM
https://github.com/MicrosoftDX
https://github.com/ms-iot
https://github.com/microsoft-mobile
https://github.com/thaliproject
https://github.com/OneGet
.
Please take a look here: https://microsoft.github.io