Ars Technica Microsoft is calling the version it's open sourcing ChakraCore. by Peter Bright
'Just as with the open sourced .NET, Microsoft intends to run ChakraCore's development as a proper community project. The company says that Intel and AMD have already expressed interest in contributing, and others are sure to join them. At release, the code will be Windows-only, but Microsoft will be working to make ChakraCore cross-platform—just as it did when making .NET open source.'