The code repository, called ChakraCore, will include the key components of Chakra engine used for its Edge browser, according to a blog post.
Microsoft has applied Chakra in many Windows applications in Xboxes, its phones, and operating system.
In a performance table, Microsoft claims that Chakra is faster than competing engines in Google's Chrome and Mozilla's Firefox browsers, as well as its own Internet Explorer 11 browser.
ChakraCore will initially only be available for Windows when its released in January, but plans call for bringing it to other platforms. After the repository is available, Microsoft is going to provide guidance on its initial priorities.
"The community is at the heart of any open source project, so we look forward to the community cloning the repository, inspecting the code, building it, and contributing everything from new functionality to tests or bug fixes," Microsoft wrote.