I'm no huge fan of Microsoft but leading that list with Azure made me recall a nice experience I had with their devs.

One of their APIs was missing something I needed so I created an issue on Github. Not only did the devs respond, they thanked me profusely for the input and made the (rather significant) change in days. I don't know if it's true or not, but I felt like their only user whenever I interacted with them (their issue tracker was rather empty...)

I had a similar experience with MS employees for an issue on a third party SQL driver using it with Azure SQL... very courteous, professional, and was included on some internal email chains to keep me informed. It did take a couple days, but the effort was very nice to say the least.

It was an Azure team member that spotted the bug and worked with some of the MS SQL guys to resolve the issue.

I can't speak for the larger organization, but will say that the Azure and .Net Core teams have been incredibly open and responsive. And with a huge amount of their devdiv stuff in Github, it doesn't surprise me they'd be one of the largest corporate contributors on Github.

and many more but this is still not the entire list:

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

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.

Historically I believe F# was the first project Microsoft open sourced. I'm not sure the current incarnation of the project reflects the entire history, but the language has active community contributors, with Don Syme of MSR acting as benevolent dictator. https://github.com/Microsoft/visualfsharp/graphs/contributor...

The WiX toolset is Microsoft's first open-sourced project: https://github.com/wixtoolset