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Oppia’s mission is to provide a learning platform that meets the unique needs for under resourced communities.
Welcome to the English-language Wiktionary, a collaborative project to produce a free-content multilingual dictionary. It aims to describe all words of all languages using definitions and descriptions in English.
Transiscope’s goal is to raise the visibility of all the alternatives working for transition by collecting existing data and creating a single map to display the initiatives.
A very large collection of works placed in the public domain.
A Tale of Software, Skateboards, and Raspberry Ice Cream!
OBIS builds and maintains a global alliance of scientists to facilitate free and open access to data and information on biodiversity and marine life.
Works of art can be viewed according to era, department or usage rights.
After five years and the participation of 14,000 volunteers, the Courtauld Institute of Art has opened its internationally renowned, multi-million-image digital photography collection to the public for free.
Platform for interactively exploring the evolutionary relationships between all known species, offering detailed information on all clades and links to other resources.
Founded in 2002 by Nobel Laureate Carl Wieman, the PhET Interactive Simulations project at the University of Colorado Boulder creates free interactive math and science simulations.
Over 6,000 Free Cheat Sheets, Revision Aids and Quick References!
A collection of free printable digital collage & ephemera sheets using authentic vintage images from the public domain.
