Linked from
The 23 pages that link to Source code, each with the reason it gives.
CompilerRelated: It is the input that a source-to-target compiler translates.
Character encodingRelated: A compiler must decode source bytes into the intended characters.
Free softwareRelated: Access to source code makes studying and modifying software possible.
Trade secretRelated: Companies may protect valuable, nonpublic code as a trade secret.
Free software movementRelated: Studying and modifying software requires access to its source code.
Text fileRelated: Programming languages are often written and shared in text files.