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.
JetBrains is also a big supporter of open source projects and has kindly provided licenses for their fantastic IDE IntelliJ to ALA. Learn more at the IntelliJ site.