LinuxDoc sgml is a highly configurable text format for writing documentation, something like html only it's simpler and can be converted to various other formats, including html for websites. You write a LinuxDoc document using any text editor such as vim. Then you use linuxdoc-tools to convert it to html, rtf, plain-text (install linuxdoc-tools-text), info (install linuxdoc-tools-info), LaTeX, dvi or postscript (install linuxdoc-tools-latex). The sgmltools-lite package can convert LinuxDoc to DocBook format.

LinuxDoc can automatically create a table of contents. It's easier to write and read than DocBook since it allows one to omit most closing tags while paragraphs are separated by just blank lines.