LinuxMedNews reviews FreePM, an open-source medical practice
management system licensed under the GNU General Public
License:
"Like any commercial Electronic Medical Record (EMR),
FreePM includes the things you'd expect in such a package:
appointment scheduling, encounter records, medication records,
prescription writing, billing and insurance. The full version is
available for download without charge from the company's web site.
The web site also has an online demo of the software, so you can
try it yourself."