Ruby https://practicingruby.com/articles/gentle-intro-to-actor-based-concurrency Java http://www.cs.colorado.edu/~kena/classes/5448/s11/presentations/srinivas_panchapakesan_pres.pdf Scala http://danielwestheide.com/blog/2013/02/27/the-neophytes-guide-to-scala-part-14-the-actor-approach-to-concurrency.html