It is a rich client multi-platform open-source EMR designed to evolve to a healthcare information system (HIS)
Features common to all modules:
Unlimited number of forms can be created using the Form Editor.
Unlimited number of orders, appointment types, resources, or any other entity can be created using the respective Editor.
Every menu and toolbar can be customized per user, per role, per group using the Form Editor.
Every view, table, form, controls can be customized per user, per role, per group using the Form Editor.
Every visual piece of text can be translated to another language.
Clinical and Administrative Forms
Manage users and multiple roles per user using the User Editor.
Create custom batch jobs for repeated execution.
Create custom schedules for batch jobs.
Import/Export users to XML for system or environment migration.
Received 13 out of 14 thumbs up review on sourceforge (http://sourceforge.net/projects/patientos/)
A short description or sort of review (comparing it to OpenEMR) is found in a forum: http://www.emrupdate.com/forums/p/14014/82230.aspx
Medfloss.org review: http://www.medfloss.org/node/161
Review from Nyayahealth.org: http://wiki.nyayahealth.org/EMR