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Re:Microsoft Open Sources C# Compiler by bch on Thursday April 03, 2014 @04:28PM (#7526310)
Grand Central Dispatch[0] is the latest (2009) I can think of...

[0] http://en.wikipedia.org/wiki/Grand_Central_Dispatch

Re:Microsoft Open Sources C# Compiler by justincormack on Thursday April 03, 2014 @04:32PM (#7526351)
"We're going to the standards bodies, starting tomorrow, and we're going to make FaceTime an open industry standard" 2010. Oh yes, that never happened.
Re:Microsoft Open Sources C# Compiler by Alphasite_ on Thursday April 03, 2014 @05:05PM (#7526666)
Their Clang Arm64 back end as well, among other things.