DokuWiki - DokuWiki is a simple to use and highly versatile Open Source wiki software that doesn't require a database.
Flickr - image and video hosting website
Wiki.js - An open source, modern and powerful wiki app built on Node.js, Git, and Markdown.
Imgur - Imgur is a free and simple image hosting service with image editing feature. Signup is optional.
TiddlyWiki - a non-linear personal web notebook
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.