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Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.
GasBuddy - GasBuddy lets you search for Gas Prices by city, state, zip code, with listings for all cities in the USA and Canada. Updated in real-time, with national average price for gasoline, current trends, and mapping tools.
Greenstone Digital Library - Greenstone is a suite of software tools for building and distributing digital library collections...
Nomulus - Google's open source, cloud-based registry platform for operating top-level domains.
Koha - Koha is the first free and open source software library automation package (ILS).