TinyCat - The online catalog and integrated library system for tiny libraries, powered by LibraryThing.
Invision - Prototyping and collaboration for design teams
Koha - Koha is the first free and open source software library automation package (ILS).
Plant - Version control app and plugin for Sketch
DSpace - DSpace open source software enables open sharing of content that spans organizations, continents...
Atomic - The fastest way to design beautiful interactions