So you're going to wire it up like on page 37 or thereabouts?http://datasheets.maxim-ic.com/en/ds/MAX6955.pdf
I am not aware of any library's (did you search the Playground?),
but as its just an I2C interface, where you send some set-up commands, and then send a command for the data you want displayed from Table 8 on page 21,
you could send over the data you want displayed using Wire.write commands, pull it from an array.http://arduino.cc/en/Reference/Wire
Wire.write( display [ x ] ); // where x is the element from the array you want displayed
display might contain 0x00000001 for the digit 1,
display might contain 0x00000010 for the digit 2
etc for 3,4,5,6,7,8,9,
then 0x00001010 for A, etc for B,C,D,E,F,
then other letters/characters as you need.
The key is reading the datasheet and getting all the needed commands sent during void setup() so the part knows how its operating.