According to Wikipedia, a worldlang is “a type of international auxiliary language (or auxlang) that derives its roots, phonology, and possibly grammar from different language families in order to avoid perceived European bias.”
Endangered languages face many threats, though it is not clear if worldlangs will gain enough speakers to cause a language to become silenced. The Ardano site claims that Ardano is a positive influence on endangered languages.
See the language course page for lessons in Ardano. See Neo Patwa for many resources for the language Neo Patwa including dictionaries. Also, see Pandunia for resources on that language including a glossary.