OCaml Batteries Included serves the following purposes: define a standard set of libraries that may be expected on every compliant installation of OCaml, organize these libraries into a hierarchy of modules with one source of documentation, and provide a consistent API for otherwise independent libraries.
Hatta is a small wiki engine for use inside a Mercurial repository. It can run locally and doesn't require any configuration; it's just a single Python file. It can be also configured to run on a Web server. Since the wiki can be cloned and merged along with the repository, it's perfect for working on project documentation in small teams.
The ManEdit UNIX Manual Page Editor is an editor specifically tailored for UNIX manual pages. It has a preview viewer, uses the manual page XML format for easy editing, and comes with a tutorial and reference guide. It uses the GTK+ widget set and features syntax highlighting, a complete drag and drop system for easy viewing and editing, a crash recovery system, and sample manual page templates.
The Docbkx Maven Plugin allows you to generate different types of output from DocBook sources. Its main advantage over many other types of DocBook XSL based tools is that you don't need to install the tool or any of the other required tools at all to get it to work. As long as you have Maven 2 installed on your system, you're basically done.
Autodia is a command line Perl application that generates UML class diagrams from source code, SQL, and database connections. It supports multiple programming languages including SQL, and can output images (using GraphViz/VCG/SpringGraph), Dia XML and Umbrello XML, or custom formats using templates.
Sputnik is a content management system (CMS) designed for extensibility. It works as a wiki out of the box, but can be extended into other things. It offers editable nodes, history and diff, user accounts with optional email validation, a flexible permission system, RSS feeds, and more. Sputnik supports access control and has editable templates. It can be used to maintain a personal Web site that doesn't look like a wiki and that only you can edit. Sputnik is easy to install on shared hosting without root accounts.