Features:
6 address select pins: You can wire up to 62 of these on a single i2c bus, a total of 992 outputs.
Adjustable frequency PWM up to about 1.6 KHz; Configurable push-pull or open-drain outputManufacturer.
12-bit resolution for each output - for servos, that means about 4us resolution at 60Hz update rate.
You can control it from a 3.3V microcontroller and still safely drive up to 6V outputs (this is good for when you want to control white or blue LEDs with 3.4+ forward voltages).
3 pin connectors in groups of 4 so you can plug in 16 servos at once (Servo plugs are slightly wider than 0.1" so you can only stack 4 next to each other on 0.1" header.

Cascade design:
V + line to place a large capacitor, the maximum external input voltage depends on the 10V 1000uf capacitor.
All PWM output lines have a 220 ohm series resistor protection and can easily drive LED.