Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.
Bots UI Kit - Fully customizable Sketch UI Kit for Messenger Platform
Greenstone Digital Library - Greenstone is a suite of software tools for building and distributing digital library collections...
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Koha - Koha is the first free and open source software library automation package (ILS).
Landing UI Kit - Handcrafted UI components for landing pages