quantgif.dll used by GifT
This dll is used convert images to .gif files with the aid of FreeImage's color quantization algorithms. Much of the source code is borrowed from UnFREEz which is a program to combine multiple gif images to create animation.
Credits:
FreeImage: http://freeimage.sourceforge.net/
UnFREEz: http://www.whitsoftdev.com/unfreez/