Hydrus

Hydrus is a desktop application for organizing media files held on a local machine. It is published under the Hydrus Network name, and its stated purpose is arranging collections of media on the computer where it runs rather than in a hosted service.

The available platform data lists Linux only, so anyone working on another operating system should check the project's own material before planning around it. The program is released under the WTFPL, a permissive licence that attaches essentially no conditions to copying, modification, or redistribution; that governs reuse of the source and says nothing about how the program behaves at runtime.

The facts on hand describe the application at the level of purpose rather than mechanics. Import workflows, metadata schemes, and on-disk storage layout are therefore not documented in this entry. Readers weighing it against a particular collection or a particular volume of files should consult upstream documentation for those specifics.