As stated in the blog post
We stretched out the elegant Caliburn.Micro with reactive Ui to provide a flexible interface and provide great testability.
For more information on Reactive Extensions, you can check out Paul Betts latest talk , one of the creators of GitHub for Windows.
By the way, βincredible looksβ can also come from design research and work. In this post, you will find a story about the GitHub Design for Windows user interface topic, Tim Clem, also one of the creators of GfW.
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