WikkaWiki : WikkaWiki is a flexible, standards-compliant and lightweight wiki engine written in PHP, which uses MySQL to store pages.
Outline : Team wiki, documentation, meeting notes, playbooks, onboarding, work logs, brainstorming, & more…
Buildbot : Buildbot is an open-source framework for automating software build, test, and release processes.
Tiki Groupware/CMS : Tiki Wiki CMS Groupware is a free and open source Wiki-based content management system and online office suite written primarily in PHP and distribute...
Kanboard : Kanboard is a free and open source Kanban project management software.
DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.