PatientOS is a free EMR system for physician offices and clinics. The system is designed to scale and evolve to be a fully fledged healthcare information system for hospitals.
Version 0.40 adds an HL7 laboratory result inbound interface (ORU^R01). A basic result viewer has been added to the chart.
PatientOS version 0.40 includes a demonstration web based Patient Portal. Patients can login and submit a progress form which is filed into their chart.
The patients chart includes a Flowsheet tab which displays the discrete details submitted via the Patient Portal. Basic communication orders can be created.

An email service has been added to allow the composition of text or HTML emails.

A Batch Scheduler has been created. Batch Jobs can be defined and executed at scheduled times.
http://www.patientos.org