Mercurymover-h is a project mainly written in ..., it's free.
mercury mover
mercurymover-h is a mercury mover registration system hack to reset the usage count to 100
gem install plist http://www.heliumfoot.com/mercurymover/downloader
Use crontab to run the scrip on hourly bases or as needed.
$crontab -l
min hour mday month wday command
Run at the minute 1 every 2 hours
1 /2 ruby /Users/dani/Development/github/mercurymover-h/reset.rb
run every minute
/1 * ruby /Users/dani/Development/github/mercurymover-h/reset.rb