There are tools that are useful for app development, and they are bundled as Additional Tools for Xcode.
Network Link Conditioner simulates bad network connection, such as high latency DNS or Edge/2G network.
Clipboard Viewer list the different clipboards and the data they are holding.
Repeat After Me convert text to phonomes and sound, and you can even adjust the frequency as points on a graph!
Pixie is a super magnifier for your screen.
There are many other tools for Audio, Graphics and Hardwares.
- Crash Reporter Preferences
- Quartz Composer Visualizer
- HomeKit Accessory Simulator
- Apple Bluetooth Guidelines Validator