RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.
DontPayFull - Verified coupons and discounts for a variety of online retailers.
Greenstone Digital Library - Greenstone is a suite of software tools for building and distributing digital library collections...
Dealspotr - Dealspotr is like Wikipedia for deals.
Koha - Koha is the first free and open source software library automation package (ILS).