A collaborative project to produce a free-content multilingual dictionary that aims to describe all words of all languages using definitions and descriptions in English.
Designed as the lexical companion to Wikipedia, Wiktionary has grown beyond a standard dictionary and now includes a thesaurus, a rhyme guide, phrase books, language statistics and extensive appendices. Etymologies, pronunciations, sample quotations, synonyms, antonyms and translations are included, when available.

Online compendium of sourced quotations from notable people and creative works in every language, translations of non-English quotes, and links to Wikipedia for further information.

Online library of free-content texts.

Free species directory that anyone can edit, covering Animalia, Plantae, Fungi, Bacteria, Archaea, Protista and all other forms of life.

Free knowledge base that can be read and edited by humans and machines alike. It centralizes access to and management of structured data, such as interwiki references and statistical information.

Database of freely usable media files to which anyone can contribute.

Worldwide travel guide that anyone can edit.