SBT

SBT is by far the most often used build tool for the Scala community. The official name now is SBT but was known as "Simple Build Tool", unofficially people call it "Scala Build Tool". Whatever name you prefer, this is an amazing build tool. Built on Scala, you can set up either declaratively or programmatically. The build tool is capable of multi-module projects, custom talks, scopes, and has multiple plugins developed by the community.