title_body: Are there any sites you can use to develop an online course for your own conlang?
upvoted_answer: Apparently folks can do this with Memrise, as evidenced by the Sajem Tan lessons.
  
  There's been talk that I found on Duolingo forums, but if they're at all serious, they probably won't allow "dabbling". You'd need a serious effort to make and maintain enough lessons for people to actually learn a language.