Open Health News Most Popular 'Open' Health IT Systems in 2011

Check out the most popular 'open source' or 'public domain' Health IT systems listed under the Resources Section on Open Health News (OHN), according to our readers. They are ranked by the number of people viewing the software product during 2011, starting with the most visited ones.

Ranking #1-10
VistA    [VA VistA, OpenVistA, vxVistA, WorldVistA, OSEHRA, etc.]
OSCAR
Kitware    [ITK, VTK, Paraview, etc.]
OpenEMR
Clear Health
OpenMRS
Mirth
RPMS
PHIN
OpenHRE

There were many other high quality open source solutions right behind these front runners, e.g. Epi Info/Map, Open Dental, NEDSS, My Family Health Portrait, Tolven, Apelon, Medline/PubMed, Open ISES, Ushahidi, and more.

Which one was your favorite? What other 'Open Source' or Public Domain  Health IT Systems would you strongly recommend to others?