VibeMe is a simple, stylish app that lets you to explore and enjoy a variety of vibration patterns on your iPhone & iPad. VibeMe uses the device's Taptic engine to create intuitive, fluid & flexible vibration patterns. Tuneable controls allow users to personalise their experience.
Here's a summary of features offered by the app;
Multitude of vibration patterns (list updated regularly)
Built-in styles for speed & intensity
Manual speed & intensity control
Screen touch lock/unlock to prevent inadvertent taps
Widgets to quickly access the patterns