Functional Programming Principles in Scala - Amazing course.
Metals - Work-in-progress language server for Scala.
Scala Native - Scala compiled to LLVM.
almond - Scala kernel for Jupyter.
Fury - Experimental dependency manager and build tool for Scala.
Scala Best Practices - Collection of Scala best practices.
scala-steward - Robot that helps you keeping your Scala projects up-to-date.