Football-possession-timer is a project mainly written in ..., it's free.
a tool used to gather statistics on football possession time
interface
toggle window on-top
home team away team
left click: switch to home team, now home team has the ball right click: switch to away team middle click: toggle dead ball status
use keyboard 1 switch to home team 2 switch to away team 0 toggle dead ball status
show: total time home team possession time and percentage away team possession time and percentage