Vim two-pane outliner

 VOoM (Vim Outliner of Markups) is a plugin for Vim that emulates
 a two-pane text outlineer.
 .
 The following markup modes are available:
   - fmr(Default Mode) -- Start fold markers with levels:
        {{{1, {{{2, {{{3, etc. Headline text is before the marker.
   - fmr1, fmr2 fmr3 -- start fold markers with levels. Variations of
                         the default mode.
   - wiki -- MediaWiki, headlines are surrounded by '=';
   - vimwiki -- vimwiki plugin
   - viki -- Viki/Deplate plugin
   - dokuwiki -- DokuWiki;
   - org -- Emacs Org-mode;
   - rest -- reStructuredText section titles;
   - markdown -- Markdown headers, both Setext-style and Atx-style;
   - pandoc -- Pandoc Markdown;
   - hashes -- #, ##, ###, etc. (Atx-style headers, a subset of Markdown
                 format);
   - txt2tags -- txt2tags titles and numbered titles;
   - asciidoc -- AsciiDoc document and section titles, both styles;
   - latex -- LaTeX sectioning and some other commands;
   - latexDtx -- Same as LaTeX but for .dtx files (Documented LaTeX sources).
   - taskpaper -- TaskPaper
   - thevimoutliner -- The Vim Outliner plugin
   - vimoutliner -- VimOutliner plugin
   - cwiki
   - inverseAtx -- inverse Atx-style headers;
   - html -- HTML heading tags, single line only;
   - python -- Python code browser, blocks between 'class' and 'def' are
                also nodes.
   - paragraphBlank, paragraphIndent, paragraphNoIndent -- For working with
                             paragraphs. Handy for sorting blocks of lines.