fd.apidoc – a documentation system
apidoc is a system for documententing APIs; what they are and by whom they are used. In this context API is any interface that one system provide for programs in other systems to consume.
The systems and APIs are described by apidoc files.
apidoc can be set up to monitor external apidoc files and automatically incorporate them into the documentation set. Systems are encouraged to host their own apidoc files.