The following companies and organisations have kindly agreed to supply the spray development team with free open-source licenses of their excellent development tools:

We use IntelliJ IDEA Ultimate as the Scala IDE of our choice.
YourKit is kindly supporting open source projects with its full-featured Java Profiler. YourKit, LLC is the creator of innovative and intelligent tools for profiling Java and .NET applications. Take a look at YourKit’s leading software products: YourKit Java Profiler and YourKit .NET Profiler.