Apps with 'Tag based' feature
AlternativeTo is a website which lists alternatives to web-based software, desktop computer software, and mobile apps.
Evernote is a cross-platform, freemium app designed for note taking, organizing, and archiving.
The simplest way to keep notes.
Standard Notes is a simple and private notes app. It allows you to write and sync your notes across all your devices, including your iPhone, iPad, Mac, and web browser.
Save Anything from Around the Web, organize with ease, ind your content with search, and collaborate.
Multi-Platform Clipboard Manager with Advanced Features.
Professional digital photo management software to organize, tag, compare and process photo collections.
NoteLedge Cloud is the world's most versatile multimedia note-taking app that allows you to take notes, sketch your ideas, record audio and video, organize multimedia content, share and present your work.
TagSpaces is an open source personal data manager.It helps you organize and browse your files on every platform.Cross-platform file tagging and file finding
Tixati is a peer-to-peer file sharing program that uses the popular BitTorrent protocol.
Matomo, previously Piwik and before that PHPMyVisites, is a downloadable, open-source (GPL-licensed) web analytics software program.
Pinboard is a personal archive for things you find online and don't want to forget.
Org mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system.
Colorful & powerful sticky notes app for Windows & Phones. Set reminder alarms, attach them to any website or document, organize them using folders/tags, sync sticky notes between devices & send notes across LAN or to any contact across the globe.