Hydrus!

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

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

Cubet board is an open source pin based social photo sharing website that allows users to create and manage their image collections. The collections can be managed into different categories based on the users tastes. Users have the privilege to go through other collections as they like, re-pin the images to their personal or public collections.

Build your own private Pinterest in 5 minutes. Myyna is Completely free & open, Highly scalable, Solid robust back end, Easy to install, Easy to customize, SleekJS frame work

tagfs is Fuse file system to organize your files using tags.