this one is suitable for small internet cafe or school lab.
it can record, monitor and control remote pc in local network such as lock/unlock screen, retstart, logff, shutdown, send waning, capture screen and check running program.
the monitoring of pc usage is updated every second and currency is based on your computer regional setting.
also can record your billing and collection amount for the day.
and.... the most important part is, it's free.

you can download PenyuLAN software for internet cafe here