Ido
Ido (io) is an international language that many people understand (at least as many as Esperanto), but fewer people write in, and I think that it would be beneficial to add to the list.
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Comments
As per German Wikipedia Ido is spoken by some 2.000-5.000 people (the corresponding enlish artikel talks about way less, 100-200 users), vs. Esperanto with some 50.000 (english Wikipedia: 10.000 - 2.000.000)
Main question though is whether we'd find translators?