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David J. Peterson, Developed for the TV series Game of Thrones.

L.L. Zamenhof, Designed as an easy-to-learn international auxiliary language.

Marc Okrand, Created for the Star Trek media franchise.

David J. Peterson, Used in the fantasy television series Game of Thrones.

J.R.R. Tolkien, Invented for Elves in the Middle-earth universe.

De Beaufront and others, Designed as a simplified version of Esperanto.

François Sudre, Based on musical notes aiming at universality.

Paul Frommer, Created for James Cameron's film Avatar.

Logical Language Group, Designed to test the linguistic hypothesis of the Sapir-Whorf theory.

Ron Clark and Wendy Ashby, Designed as an international auxiliary language.

None (natural creole), One of the official languages of Papua New Guinea.

J.R.R. Tolkien, A fictional language spoken by Elves.

Sir Thomas More, The language of the fictional society in his book 'Utopia'.

George Orwell, Featured in the novel 1984 as a language of restricted thought.

International Auxiliary Language Association, Intended as a universal auxiliary language.

Charles Kay Ogden, A simplified version of English designed to be an international auxiliary language.

Suzette Haden Elgin, Created to express the views of women better than natural languages.

Johann Martin Schleyer, An early international auxiliary language.

Kenneth Searight, A language constructed to be logical and easy to learn.