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In May 2020, Microsoft surprised everyone (including me) by releasing the source code to GW-BASIC. Rich Turner (Microsoft) wrote in the announcement on the Microsoft Developer Blog:
Since re-open-sourcing MS-DOS 1.25 & 2.0 on GitHub last year, we’ve received numerous requests to also open-source Microsoft BASIC. Well, here we are! As clearly stated in the repo's readme, these sources are the 8088 assembly language sources from 10th Feb 1983 and are being open-sourced for historical reference and educational purposes. This means we will not be accepting PRs (Pull Requests) that modify the source in any way.
You can find the GW-BASIC source code release at the GW-BASIC GitHub. And yes, Microsoft used the MIT License, which makes this open source software.
https://devblogs.microsoft.com/commandline/microsoft-open-sources-gw-basic/