epydoc.el is an Emacs LISP program to write Epydoc documentation comments. It supports forrow functions. epydoc-insert-file-comment inserts file comments and @file, @author, and @copyright automatically. epydoc-insert-function-comment inserts function comments and @param/@return automatically. epydoc.el is based on Tom Emerson's doxygen.el.
Geiser is a generic Emacs/Scheme interaction mode, featuring an enhanced REPL and a set of minor modes that improve Emacs' basic major mode for Scheme. The main features provided are evaluation of forms in the namespace of the current module, macro expansion, loading of files and modules, namespace-aware identifier completion, automatic documentation, jumping to the definition of an identifier, access to documentation, listings of identifiers exported by a given module, and rudimentary support for debugging. Geiser supports Guile and Racket.