Medscribbler Lite is a free EMR that is a full system including scheduling, document management, messaging, prescription writing etc. It was also the first EMR to have embedded handwriting for the Tablet Pc . It runs client server and has a backup module included. We do not keep records of how many use it but it seeems to be very popular among psychiatrists.
It is available free at
http://www.medscribbler.com/Free_EMR.php. You have to be a doctor and it helps to know your UPIN and the correct information of your registration.