DSpace - DSpace open source software enables open sharing of content that spans organizations, continents...
Ambra - Ambra is an innovative Open Source platform for publishing Open Access research articles.
Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Koha - Koha is the first free and open source software library automation package (ILS).
Keepy - Organize & Save your kids' artwork, schoolwork and mementos