You basically use it instead of Maven or Ant to build Scala/Java projects, but it's ridiculously comprehensive and extensive. I'm not sure calling it a mere "b

You basically use it instead of Maven or Ant to build Scala/Java projects, but it's ridiculously comprehensive and extensive. I'm not sure calling it a mere "build tool" does it justice, more like "Recursive Extensible Project Management Tool" or something along those lines. And yes, it has both package management system and a REPL, among other things.