PyleWiki is a WikiClone written entirely in Python that allows a group of people to collaboratively edit a tree of webpages using nothing but their browser and a simple, text-based markup language. This particular WikiClone has a few extensions to the original: attachments to pages, user authentication (primitive), and the use of templates for page styling among others.
SCT (Sphene Community Tools) is a collection of Django applications that are designed to be easily pluggable into any Django project. It currently consists of a Wiki and a Board application. It contains an example project that allows users to create a community Web site containing the Wiki and Board applications without any further coding/configuration changes.
folder2blog is a minimalist blog engine based on plain text. You maintain a folder of text files, one for each article, and folder2blog dynamically maps it to blog-ish HTML/RSS2 output. Comments are appended to each text file. Managing articles/comments now becomes creating or editing text files. For example, all you do is edit a local folder of plain text files and sync it with the server, manually or using tools such as rsync, over SSH or FTP. The encoding may be anything (UTF-8 by default). The HTML formatter is any external program, such as markdown, that may act as a pipe. The owner receives notification email for each comment. There is basic spam protection.
Pftf (Pining for the Fjords) is another take at time keeping and work time accounting. It lets you keep track of how much time you spent working on what, figure out how much work you are or were supposed to do, taking into account holidays, vacation, sick time, etc., and build graphs showing the acquired data.
NoteFinder is an application for managing any text information: notes, quotes, conversations, drafts, articles, contacts, etc. It features creating, viewing, editing, renaming, deleting entries, rich text formatting, inline calculations (e.g., use ~7+8~ to get 15, or functions and constants from Python's math module, such as sqrt, sin, and pi), organizing entries chronologically (creation dates) and semantically (tags), advanced search (with date:, tag:, title:, year:, month:, and day: parameters), saving searches, multiple notebooks, multiple backends, the ability to move/copy entries from one notebook to another, synchronizing via email/Wiki, linking entries together, CamelCase links support, and a tabbed interface.