fgallery - fgallery: a modern, minimalist javascript photo gallery
DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
ProGram - CLI based, self-hosted Instagram-esque gallery
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Google Photos - All your photos are backed up safely, organized and labeled automatically, so you can find them fast, and share them how you like.
Tiki Wiki CMS Groupware - Tiki Wiki CMS Groupware, also known as Tiki (or TikiWiki), is a full-featured, web-based, multilingual, all-in-one Free/Libre Open Source Software solution. Tiki can be used to create all kinds of web apps, portals, knowledge bases, intranets, etc.