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The most prosperous were Volapük (1879, Johann Martin Schleyer), Esperanto (1887 Ludwik Lejzer Zamenhof), Latino sine flexione (1903, Giuseppe Peano), Ido (1907, Louis Couturat), Occidental-Interlingue (1922, Edgar de Wahl) and Interlingua (1951, IALA and Alexander Gode), with Esperanto being the only one still gathering a considerable community of active speakers today.
Based in Amsterdam, the Netherlands, its main functions are the propagation of the language, arranging the yearly conferences in which Ido speakers gather, and the publishing of the magazine Progreso (progress), begun in 1908 by Louis Couturat, one of the founders of the movement who died in 1914.