I coded SackFix in 2016 and 2017 to learn Scala and AKKA with a real world spec. It took many months and was coded in 60 minute gaps between real life. Having said that I focused in the last few months and tidied up some of the issues.
It has all the most obvious features of a fix implementation, hope it is used/useful. I intend to move onto a more interesting personal project now.
It is released under the MIT license, so please download it and change it as you need to.
Jonathan April 2017