Because it is useful I decided to continue to permit hierarchy for saved searches even though behavior will be a bit strange. The following behaviors exist and will not be changed. - Renames will not rename all items in the the hierarchy. - Intermediate nodes that aren't 'real' searches will not offer the rename option. - Drag & drop is disabled. In addition I changed the behavior of "Add search" in "Manage saved searches". It used to act like a rename if the target name already exists, throwing away the old search expression. It now refuses.
calibre

calibre is an e-book manager. It can view, convert, edit and catalog e-books in all of the major e-book formats. It can also talk to e-book reader devices. It can go out to the internet and fetch metadata for your books. It can download newspapers and convert them into e-books for convenient reading. It is cross platform, running on Linux, Windows and macOS.
For more information, see the calibre About page
Screenshots
Usage
See the User Manual
Development
Setting up a development environment for calibre
A tarball of the source code for the current calibre release.
Bugs
Bug reports and feature requests should be made in the calibre bug tracker at launchpad. GitHub is only used for code hosting and pull requests.
Support calibre
calibre is a result of the efforts of many volunteers from all over the world. If you find it useful, please consider contributing to support its development. Donate to support calibre development.
Building calibre binaries
See Build instructions for instructions on how to build the calibre binaries and installers for all the platforms calibre supports.