C
In computing, C is a general-purpose, block structured, procedural, imperative computer programming language developed in 1972 by Dennis Ritchie at the Bell Telephone Laboratories for use with the Unix operating system.
Application
Any
Platform
Linux
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License
Open Source
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You'll probably need to know a little assembly as well, but C and or C++ should be good for most of the OS. Here's some links that I've seen mentioned, but I've never tried to write my own OS, so I...