OpenEMR is a free medical practice management, electronic medical records, prescription writing, and medical billing application. These programs are also referred to as electronic health records. OpenEMR is licensed under the General Gnu Public License (General GPL). It is a free open source replacement for medical applications such as Medical Manager, Health Pro, and Misys. It features support for EDI billing to clearing houses such as MedAvant and ZirMED using ANSI X12. Medical claim and accounts receivable are accomplished through SQL-Ledger, which has been customized. Calendar features include categories for appointment types, colors associated with appointment types, repeating appointments, and the ability to restrict appointments based on type. There are customizable medical encounter forms, support for voice recognition software, and electronic or scanned digital document management for records.