WackoWiki is a light and easy to install multilingual Wiki-engine. Supports WYTIWYG-editing, page rights (ACLs), design themes (skins), file upload, email notification and much more. Compatible with PHP7 and MariaDB / MySQL.
TEA is powerful text editor that provides hundreds of text processing functions. It supports QML plugins and external scripts. TEA can open plain text files, FB2, ODT, RTF, DOCX, Abiword, KWord KWD, SWX, PDF, DJVU. Other features: Built-in MC-like file manager. Spellchecker (using the aspell or/and Hunspell). Tabbed layout engine. Syntax highlighting for C, C++, Bash script, BASIC, C#, D, Fortran, Java, LilyPond, Lout, Lua, NASM, NSIS, Pascal, Perl, PHP, PO (gettext), Python, Seed7, TeX/LaTeX,
Fossil is a distributed version control system, quite robust and easy to use. It manages local and remote repositories, user permissions, has a built-in wiki, bugtracker, release blog and an extendable web interface. It's github-in-a-box as all features are packed into a stand-alone executable which also doubles as server. Internally the database utilizes SQLite and allows extending that or its user interface through TCL or the builtin TH1 scripting language. An optional JSON API permits further
GitLab is a development collaboration tool and git DVCS frontend. It includes repository management features, code reviews, an issue tracker, activity feeds and wikis. GitLab provides fine-grained access control, user management, 5 permission levels and branch constraints, and can utilize LDAP/AD intranet authorization. Powered by Ruby on Rails it comes as open source package, and as commercial supported enterprise version.
Trac is a software project and release management tool, and source control frontend for Git and Subversion. It provides issue tracking, timelines, progress/roadmap tracking and documentation features (Wiki with MarkDown support).
mobiki is a small wiki engine implemented as one PHP file. It is optimized for usage with mobile devices with limited bandwidth and for fast HTML5 content delivery. It will stay small, understandable and easy to hack - no bells, no whistles - just tin whistles. If you like, load this webpage in your mobile phone and see, how really fast it is! More about mobiki.
PhpWiki is one of the earliest WikiWikiWeb clones implemented in PHP. Wikis are used for collaborative and per default authorization-less editing and provide a natural markup for structuring and easy hyperlinking. PhpWiki requires little initial configuration, comes with plugins and many built-in page extensions, and is fully gettext-internationalized.