An Arduino library for Adafruit's 7-segment displays (i2c) like this or that.
The library is much simpler than the library provided by Adafruit.
It based on Peter Sjoberg's ht16k33 library.
With version 2.0.0 the syntax has changed. Functions that do not end in Now only work in memory. To actually update the LED's, the sendLed() function must be called (see example file simple-test.cpp).