WackoWiki is a small, lightweight, handy, expandable Wiki clone. Its main advantages are a visual (WYSIWYG) editor, an easy installer, full Russian support, many localizations, email notification on changes/comments, several cache levels, design themes (skins) support, XHTML compliance, page rights (ACLs), and page comments.
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.
DrProject is a Web-based software project management portal that integrates a revision history viewer with issue tracking, mailing list management, a wiki, and other features. It is not a learning management system; instead, it is designed to introduce students to the tools that professional development teams use to coordinate their work. Unlike its industrial-strength cousins, SourceForge and CollabNet, DrProject is easy to install and administer. It has a very simple interface: students can learn all of its features in less than an hour. It provides a scripting interface that can be used to automate bulk or repetitive tasks.
PottyMouth transforms completely unstructured and untrusted text to valid, nice-looking, completely safe XHTML. PottyMouth is designed to handle input text from non-technical, potentially careless, or malicious users. It produces HTML that is completely safe, programmatically and visually, to include on any Web page. You don't need to make your users read any instructions before they start typing. They don't even need to know that PottyMouth is being used.
The KiWi core system is a flexible platform for building different kinds of semantic social software applications on top (currently the Semantic Wiki and the TagIT application). It provides all the core services required in such applications, like editing and tagging, the storage of content and associated meta-data, its own triple store, transactions and versioning over content and meta-data, a linked open data server, and many small features semantic social software developers will like (like convenience services for working with ontologies or SKOS thesauruses, etc.).
wadWiki is a extremely light and simple Wiki engine that anyone can modify. It aims to be a fast scratchpad for arranging ideas without frills and complications. Major releases are supported for more than three years, so server requirements don't get suddenly bumped. Since it is written using only procedural functions, anyone with basic programming skills can adapt it to new requirements. The extension API is stable. There is official hosting for third-party extensions. Because collecting knowledge is not the goal of this project, if you want a full-featured wiki engine, you may wish to choose another software like MediaWiki.