This means that there is not a single implementation that defines the language, but rather an agreed upon document that any conforming C compiler must implement to be a C compiler.
There are some open source C compilers such as the GNU C compiler in the GNU Compiler Collection (https://github.com/gcc-mirror/gcc) and Clang in the LLVM project (https://clang.llvm.org/get_started.html).
There are also proprietary C compilers such as the Microsoft's C compiler (https://visualstudio.microsoft.com/vs/features/cplusplus/) and the Intel C compiler (https://www.intel.com/content/www/us/en/developer/tools/onea...).
There are many others: https://en.m.wikipedia.org/wiki/List_of_compilers#C_compiler...
Most mature C compilers will specify what version(s) of the C standard they implement so developer users can know what features are available. Many C compilers also implement non-standard extensions to the C language and libraries to be more competitive, overcome language shortcomings, or provide for specialized needs or development targets (e.g. features for embedded targets).
C is a language defined by standard, not by implementation. The ANSI C standard is defined by American National Standards Institute (ANSI).
Short list of the lasted C17 standard conformant compilers from the top of my head: Clang, GCC, Microsoft , EAR, AMD, Intel, ..
Yes. Like, for example, JavaScript, Scheme, Fortran and Common Lisp, it is a specification for a programming language that is maintained by a committee/working group
> with public repo, releases and issues?
No. Not being a language implementation, there are no releases other than the standards.
Issues and prereleases typically are discussed by the committee, with some results and progress (including some drafts of new versions) getting published before release. see thttps://www.open-std.org/jtc1/sc22/wg14/
