Sitespeed - Sitespeed.io is an open source tool that helps to analyze and optimize website speed and performance.

JRebel - Reload code changes instantly w/ JRebel. Stop redeploying in Java development & Save 10 minutes of every hour coding. Get JRebel Today - Free Trial!

Blackfire.io - Blackfire empowers all PHP developers and IT/Ops to continuously verify and improve their app’s performance, throughout its lifecycle, by getting the right information at the right moment.

XRebel - XRebel is a lightweight Java profiler that helps developers find and fix common problems in their application as they code.

Apache JMeter - Apache JMeter™.

Xcode - Xcode is Apple’s powerful integrated development environment for creating great apps for Mac, iPhone, and iPad. Xcode 4 includes the Xcode IDE, instruments, iOS Simulator, and the latest Mac OS X and iOS SDKs.