Seetxt is a lightweight text file and man page viewer for X windows. It maintains "document meta-data" for each user, allowing them to automatically keep bookmarks and highlights for read-only system files. It also has a "server mode" so that command line requests can be sent to a single running server rather than starting multiple instances. Other features include hypertext-style apropos (man page) searches, file monitoring, multi-level regular expression searching, a command history, and nice little toggle lights on the interface for the server and file monitor. There's also cross-application drag-n-drop support, and handy little features that allow you to view the output of shell commands and process the text buffer with an external command (sed, awk, grep, perl, etc.) Seetxt is POSIX compliant.
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.
BitNami DokuWiki Stack is an easy to use installer for DokuWiki, which is a standards-compliant, simple to use wiki mainly aimed at creating documentation of any kind. It is targeted at developer teams, workgroups, and small companies. It has a simple but powerful syntax that makes sure the data files remain readable outside the wiki and eases the creation of structured texts. All data is stored in plain text files; no database is required.
CodingTeam is a software forge that is lightweight and extensible. It provides a lot of collaborative tools. With this software forge, projects can benefit from basic features (such as screenshots, downloads, uploads, and news), communication features (such as chatrooms, forums, the OpenForge API, and Jabber/XMPP integration), and development features (such as a VCS code browser, a bug tracker, SVG statistics, timeline, and roadmap). Also provided are community tools (project browsing, tag clouds, notepad, and user profiles).
Markdown Doclet is a replacement for the standard Sun Java Doclet that allows developers to use Markdown syntax in their Javadoc comments rather than embedding unreadable HTML. The advantage of Markdown is that the syntax allows for HTML to be passed through, allowing the Markdown doclet to be applied to any existing codebase which may contain HTML Javadoc comments. It also includes a patched version of UMLGraph which calls the Markdown Doclet instead of the Sun standard doclet. The doclet also writes a more modern stylesheet for more attractive Javadocs.
BullDoc is a Web application for documentation building. It is generally desgined for projects developed with PHP and which use SVN or another source control system. It stores the documentation sources in the same repository as the code. The sources should be text files, so SVN can track changes and allow BullDoc to always extract a documentation version appropriate to the code. It makes it convenient to view the result of authoring by opening a page in a Web browser, without additional compiling. It also allows you to edit text directly in the Web browser.
i-net Doqua is an Eclipse plug-in that helps documentation writers and developers to keep track of inconsistencies between style guides and the actual documentation. The system integrates into the Eclipse IDE and introduces a new perspective and several views. Since i-net Doqua uses standard JUnit testcases to check the documentation, you can trigger checks using Hudson or similar Ant based systems.