Presentation of the language in multiple languages and direct communication with Esperanto speakers from countries all over the world. Features include a built-in dictionary, multimedia courses at various skill levels, and objective examinations.

Collaborative multilingual Esperanto dictionary.

Multilingual program for learning Esperanto, 16 languages available. Pronunciation, translation, songs. Free download and e-mail guidance.

Multilingual Information Center about Esperanto: Information in many languages about Esperanto

The largest international organization of Esperanto speakers. Multilingual site.

Amusingly presented introductory lesson: pronunciation, parts of speech, basic vocabulary.

Site with various books and articles on international auxiliary languages, plus links to related sites.

Youth wing of the UEA. Multilingual site.

Based on the HyperCard Esperanto course. For english speakers.

A non-profit research foundation that promotes sustainable multilingualism, through Esperanto and other means.

Despite the name, this is the national organization for the U.S.A. Site includes information about the language, the organization, local clubs, teachers and learning resources, and other topics.

Well-designed, informative site

A written language based on multimedia ideograms.

An encyclopedia article on Basic English, including sections on grammar, criticisms, and word lists.

The Introduction to the 1951 Interlingua-English Dictionary extensively explains the fundamental theory and methodology behind the international vocabulary used in Interlingua.

Artificial language created by Sumus Cacoonus.

Interdisciplinary articles on artificial language, communication and culture in language usage, typology, and universality in language with applied linguists in mind.

SASXSEK is a simple IAL designed to minimize the learning curve through a small core vocabulary, simple grammar, and powerful word-building capabilities.

An encyclopedia article on Novial, including comparison with Esperanto and Ido.

Aiola is a new constructed language that achieves a unique clarity of expression. Presents a history of the development of Aiola, an introduction to the language, and interactive exercises.

A project with the purpose to form an English-based, but neutral-pronounced written language for the European Union.