/usr/bin/annotate
/usr/bin/bdftogd
/usr/bin/gd2copypal
/usr/bin/gd2togif
/usr/bin/gd2topng
/usr/bin/gdcmpgif
/usr/bin/gdparttopng
/usr/bin/gdtopng
/usr/bin/giftogd2
/usr/bin/pngtogd2
/usr/bin/pngtogd
/usr/bin/webpng
You may install this package on CentOS with
yum
install gd-progs