Was wondering how many people were aware that Microsoft relicensed a version of their MS-DOS under an MIT license:
https://github.com/microsoft/MS-DOS I remember the topic coming up on a FreeDOS forum at one point and developers saying they couldn't use any Microsoft code because of license restrictions. Slashdot mentioned Microsoft relicensed the source. Also, GW-BASIC (
https://github.com/microsoft/GW-BASIC ) is available under an MIT license. It would be interesting to build it from source, but I don't see any makefiles and I don't think it's compatible with GNU asm tools.