Hydrus - A personal booru-style media tagger that can import files and tags from your hard drive and popular...

Pinry - Pinry is a private, self-hosted, Pinterest inspired by Wookmark and built on top of Django.

Danbooru - Danbooru is an advanced, tag-based image board system that is based on Ruby On Rails.

Pinterest - Pinterest is a visual discovery tool that you can use to find ideas for all your projects and interests.

TMSU - TMSU is a tool for tagging your files.

Diigo - Diigo is a powerful research tool and a knowledge-sharing community