In this in-depth post, Jeroen Engels discusses the future plans for elm-review: editor and compiler integration, better performance, incremental adoption, making it easier to contribute, and potential use as an information gathering tool.
Dillon Kearns announced a live panel discussion about Elm Open Source with Aaron VonderHaar, Harry Sarson, Matt Griffith, and Ian Mackenzie on 3 October. There will also be an intro to Hacktoberfest contribution opportunities and Q&A sessions on intellij-elm, elm-review and dillonkearns/elm-markdown.
Duncan Malashock has released a music theory library for Elm. In addition to the library documentation, there is a Gitbook that explains the domain concepts in this package and how they are modelled. Looks like a fascinating project!