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.
MiniMagAsm is minimalistic, but powerful and flexible content management system (CMS). It is a rewrite of MiniMag in assembly language (FASM). As expected, it is a very small and very fast Web application. It has a flexible architecture and is highly customizable by the user without the need for the code to be changed and recompiled. The system uses .txt files to store articles, formatted with a lightweight markup language which is very similar to Markdown. MiniMagAsm is portable CGI application which runs on Windows or Linux Web hosting.
Crabgrass is social networking, group collaboration, and network organizing Web application. It consists of a solid suite of group collaboration tools such as private wikis, task lists, a file repository, and decision making tools. Work is currently being done on a large user interface overhaul, better social networking tools, blogs, and event calendars, as well as better support for collaboration and decision making among independent groups.