Apps with 'Hierarchical tagging' feature

Cross-platform app for creating and organizing notes from text, web pages, images, and voice memos. Offers security features and integrates with various tools.

Org mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system.

Ultra-ergonomic notetaking app for Windows offering text capture, file attachments, synchronization, hierarchic tagging, encryption, and automatic backups.

Amplenote allows you to take notes and link those notes to functional task and contacts lists for seamless project management. It supports integration with Google and Outlook calendars to schedule tasks and allows e-mail integration as well.

Grizzly is an open-source macOS application designed for browsing and extracting ZIP archives with speed and ease. It provides a clean, Finder-style interface with native system integrations to simplify ZIP file management.

Use Tags within the Windows File Explorer. Tag any kind of file or folder. View the tagged items in a virtual folder. Combine tags for looking up files with multiple tags. Use the tags in the Open/Save Dialogs as well.

Notenik is a note-taking app for the Mac that provides unusual levels of flexibility in terms of the types of information stored, the ways that notes can be organized, and the formatting available for output.

Ximilar is a computer vision platform for building and training custom deep learning models for image recognition, object detection, and visual search — deployable via API or offline.