Reaction to Microsoft’s announcement yesterday that it was giving up its .NET Core to open source has been swift, and largely positive.

Almost as telling as the reaction to the technical portions of the announcement was the reaction to Microsoft’s decision to open-source the .NET stack and enable it to run on Linux or Mac OS platforms.

(Related: Microsoft’s big .NET announcement)

Al Hilwa, program director of software development research at industry analysis firm IDC, tweeted: “#spacecraft lands on #comet, #Microsoft open-sources #dotnet, #VisualStudio to support #Linux & #iOS – Pigs to fly!”

Forrester Research analyst Jeffrey Hammond wrote in a note to his clients: “We’ve now come 180 degrees from Microsoft execs attacking Linux (and open source) as a ‘cancer.’ And it wasn’t that long ago that pitched battles were fought inside the halls of Redmond over cross-platform (i.e., anything but Windows) support.”

Jim Zemlin, executive director of the Linux Foundation, lauded the announcement, but noted begrudgingly, “We do not agree with everything Microsoft does, and certainly many open-source projects compete directly with Microsoft products. However, the new Microsoft we are seeing today is certainly a different organization when it comes to open source.”

Microsoft corporate vice president of the developer division Soma Somasegar said in a Monday interview with SD Times that in a mobile-first, cloud-first world, “developers are center stage.”

In his blog, Zemlin pointed out that Microsoft has always understood that developers are “masters of the universe (at least in the software world),” and added, “Open source has fundamentally altered the software industry and that puts developers…in charge.”