Easy script for making and overlaying video counters? I wanted to make a family of videos like 

                
            
and I was wondering if there were any easy plugins/scripts to be able to create and increment the counter while watching a video. I envision something that operates like a little html/java script that increments on a keystroke as you run through the video, that you can later style something like CSS. I obviously am not saying it has to be exactly like this, but in essence I want to know if there are any bits bits of software like that. If not I might just try making it.
In that case Adobe After Effects can do this easily, which probably also produced the effect in the video.
It's actually the only software where I know you can do this without too much manual labor. Other products usually only offer a timer effect which would be tedious to use for these kind of things.

Though if you want to do this based on just a single key press and don't want to set keyframes manually you will have to write a script for After Effects, this can be done either via Adobe ExtendScript which is a subset of JavaScript or alternatively Windows Batch and Apple Script. I'd suggest using ExtendScript, it has better documentation and is relativley easy to use.

Be advised that this won't be a task that you can finish in 1-2 days if you haven't worked with After Effects yet. Especially the scripting part. Do it manually first and then look how you can automate it via a script.