TinyCat - The online catalog and integrated library system for tiny libraries, powered by LibraryThing.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Koha - Koha is the first free and open source software library automation package (ILS).
Sketch - Professional digital design for Mac.
DSpace - DSpace open source software enables open sharing of content that spans organizations, continents...
Invision - Prototyping and collaboration for design teams