title_body: Conlangs based on Proto-Indo-European (PIE)? Have there been any attempts to create a language based on Proto-Indo-European (PIE)? 
  
  Of course PIE has had an effect on other languages, and through them ended up in many a posteriori conlangs as well. What I mean is whether there have been any attempts to create a usable language based on what we know of PIE and filling in the blanks with conlangery.
upvoted_answer: Academia Prisca published Modern Indo-European as a revival of a late stage of the Indo-European language (Northwest Indo-European, billed as the ancestor of Italo-Celtic, Germanic and Balto-Slavic). Resources published for learning include a grammar, syntax, conjugator, vocabulary, lessons and texts. Since it is meant as a modern revival, it introduces neologisms (such as read and write), but as far as I can tell, the entire lexicon is derived from cognate languages.