This is a tiny Mac OS X application written in MacRuby that displays logs generated in iOS applications with the NetworkLogger which is part of motion-support. Logging in this way highly improves the output for RubyMotion specs, since the spec output is not mixed with the logger output.
To compile, you need a recent version of XCode (from the App Store) as well as MacRuby installed.
Either run the application from XCode or archive it once and then copy the built application from within the archive into your Applications folder.