The multiplayer online Memory game written in Elixir/Elm and named Pairs One (http://pairs.one) has been open-sourced during a lightning talk at EuRuKo: https://github.com/mxgrn/pairs.one

The slides for the talk can be found here: http://www.slideshare.net/netzke/making-multiplayer-game-with-elixir-and-elm