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.
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.
code2flow is an experimental script which sweeps through your project source code, looking for function definitions, then does another sweep, looking for where those functions are called. It connects the dots and presents you with a flowchart estimating the functional structure of your program. It is especially useful for untangling spaghetti code and getting new developers up to speed. code2flow is experimental and meant to provide a rough overview of the structure of simple projects. Source code which is just a little esoteric will break this. Even with normal code, there are many known limitations and many outright bugs.
Jinja24Doc is a lightweight documentation generator for Python modules with jinja2 templates. It is part of the Poor HTTP group tools (WSGI connector, WSGI/HTTP Server, and mod_python connector). It can load modules and get documentation for its items. No configuration is needed, only jinja2 templates.
Goozzee allows you to easily create, browse, and share knowledge bases and documentation repositories using topic maps. It can be used standalone with an embedded database or in multi-user mode with a MySQL or MariaDB server to store its data. It can store notes and files of any type and size, create links between notes and files, browse through your knowledge base by following these links, or search notes using the fast and powerful full text search engine.