open content
content that is openly accessible and modifiable to others
open access monograph
scholarly monograph which is made freely available with a creative commons licence
Open Knowledge Foundation
non-profit organization promoting free and reusable access to knowledge
open-access journal
journal meant to have no access barriers (such as cost) for readers
Natural Earth
public domain geographic data collection
diamond open access
journal or other forms of scholarly publication with no access barriers (such as cost) for both readers and authors
Palestine Open Maps
website devoted to comparing current OpenStreetMaps with maps of Palestine from 1940s
Free Encyclopedia of Ural
free online encyclopedia
Wikipedia
free multilingual online encyclopedia
open encyclopedia
encyclopedia that is openly accessible and modifiable to others
Open music
music that allows derivative works