GupShop - Avoid fake reviews and Get suggestions from your friends to buy best products.
DSpace - DSpace open source software enables open sharing of content that spans organizations, continents...
Tag - Add clickable product tags to any image and share anywhere.
TinyCat - The online catalog and integrated library system for tiny libraries, powered by LibraryThing.
Primo - Like Amazon's 1-click shopping--but for everything
Invenio - Invenio is a free, open-source software to run a digital library or document repository on the web.