rankmirrors comes with the pacman-contrib package on the Arch Linux distribution. It is a simple utility for ranking a list of servers by their response-times. Its input is usually an ArchLinux MirrorList file and the output is determined by a set of command-line options.
Because of the simple nature of the goal, I am using this as an exercise in various programming languages. The original utility is written in bash.
The idea is to replicate functionality as closely as possible, but I may add in
some bugs features here and there.