LowerMACaddress is a project mainly written in PHP, it's free.
A PHP-Function to convert MAC Adresses from 0F:43:00:0B:CB:D3 to f:43:0:b:cb:d3
lowerMACaddress is a simple PHP-function to convert UPPERCASE MAC-Addresses to lowercase MAC-Addresses. Example: 0F:43:00:0B:CB:D3 to f:43:0:b:cb:d3 (0F -> f, 00 -> 0)
echo lowerMAC("0F:43:00:0B:CB:D3"); f:43:0:b:cb:d3
Mac OSX and iOS use this lower case format.
License: http://www.gnu.org/licenses/lgpl.html