documentr is a Web-based tool for editing and presenting software documentation. It allows you to easily maintain documentation for multiple products and product branches. Edits can easily be copied between branches, with merge conflicts being handled gracefully. It uses Markdown as its markup language, along with some extensions, and has a role-based permission system.
The DocBook Authoring and Publishing Suite (DAPS) provides a tool set for easy creation and publication of DocBook sources on Linux. It lets you create HTML (including Webhelp), PDF, EPUB, man pages, and other formats with a single command. It automatically takes care of validating and filtering (profiling) your sources and automatically converts images into a format best suited for the output format. You can easily create profiled source tarballs for translation or review. DAPS supports authors by providing linkchecker, validator, spellchecker, and editor macros. It is well suited to manage large documentation projects with multiple authors using the DAPS docmanager.
Greenhorn displays documentation strings directly from the source code itself, which is handy if you use or write your own modules whose documentation is not keeping pace with development. It uses the PyGTK treeview widget to display a tree diagram of modules in a window. Clicking on individual modules displays . __doc__ strings and sub-modules or functions. Source code can also be browsed, if available, using Python inspect.
Doxer provides a wiki-based markup language for writing source code documentation and general purpose documents. It generates HTML output and also provides a Drupal input format module. The parser and HTML generator have a strong focus on robustness to support the full range of user sophistication found on general purpose Web sites. An extensive test suite accompanies the development.
The wiki has become the clear choice for use among projects for their help documentation. Wiki Web Help takes the wiki concept and tailors it for use specifically with help documentation. It combines the best of both worlds, with operation similar to a chm viewer and the Web technologies that enable community involvement. It features a dual split pane with tabs for searching, index browsing, and display of contents (in a tree). Users can create and modify topics and pages. Pages can be tagged for index creation. Searching with highlighting is included.