emacs-wiki enables you to create and use hyperlinks and simple formatting in plain text files, and to optionally publish your pages as HTML.
The 2.71 release of emacs-wiki will probably be its last release, since Emacs Muse does the same things in a better way, with only some little-used functionality remaining to be ported. When the 3.03 release of Emacs Muse comes out, it will be considered a complete replacement for emacs-wiki.
Damien Elmes handed EmacsWikiMode to Mark Triggs for a short period of time. Mark Triggs deferred to Sacha Chua as official maintainer of PlannerMode. Sacha Chua volunteered to maintain RememberMode. Michael Olson became the maintainer of EmacsWikiMode later that year.
Sacha Chua volunteered to maintain PlannerMode. Damien Elmes volunteered to maintain EmacsWikiMode.
John Wiegley wrote EmacsWikiMode and PlannerMode.