DSpace - DSpace open source software enables open sharing of content that spans organizations, continents...
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.
Landing UI Kit - Handcrafted UI components for landing pages
Evergreen ILS - Evergreen - Open Source Library Software
Dashboard UI Kit - A modern & responsive dashboard UI kit for designers.