AmuseWiki
Amusewiki is based on the Emacs Muse markup, remaining mostly compatible with the original implementation. It can work as a read-only site, as a moderated wiki, or as a fully open wiki or even as a private site.
BookStack
BookStack is a simple, self-hosted, easy-to-use platform for organizing and storing information. It allows for documentation to be stored in a book like fashion.
django-wiki
Wiki system with complex functionality for simple integration and a superb interface. Store your knowledge with style: Use django models.
Documize
Modern Docs + Wiki software with built-in workflow, single binary executable, just bring MySQL/Percona.
Dokuwiki
Easy to use, lightweight, standards-compliant wiki engine with a simple syntax allowing reading the data outside the wiki. All data is stored in plain text files, therefore no database is required.
Gitit
Wiki program that stores pages and uploaded files in a git repository, which can then be modified using the VCS command line tools or the wiki’s web interface.
Gollum
Simple, Git-powered wiki with a sweet API and local frontend.
Mediawiki
MediaWiki is a free and open-source wiki software package written in PHP. It serves as the platform for Wikipedia and the other Wikimedia projects, used by hundreds of millions of people each month.
Mycorrhiza Wiki
Filesystem and git-based wiki engine written in Go using Mycomarkup as its primary markup language.
Otter Wiki
Simple, easy to use wiki software using markdown.
Outline
An open, extensible, wiki for your team.
Pepperminty Wiki
Complete markdown-powered wiki contained in a single PHP file.
PmWiki
Wiki-based system for collaborative creation and maintenance of websites.
Raneto
Raneto is an open source Knowledgebase platform that uses static Markdown files to power your Knowledgebase.
Tiki
Wiki CMS Groupware with the most built-in features.
TiddlyWiki
Reusable non-linear personal web notebook.
WackoWiki
WackoWiki is a light and easy to install multilingual Wiki-engine.
WikiDocs
A databaseless markdown flat-file wiki engine.
WiKiss
Wiki, simple to use and install.
Wiki.js
Modern, lightweight and powerful wiki app using Git and Markdown.
Wikmd
Modern and simple file based wiki that uses Markdown and Git.
XWiki
Second generation wiki that allows the user to extend its functionalities with a powerful extension-based architecture.
Zim
Graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images.