High Quality Content by WIKIPEDIA articles! Open Dental, previously known as Free Dental, is a Practice Management Software licensed under the GNU General Public License. It is written in the C# programming language compatible with Microsoft .NET Framework and was first released in 2003. Current versions of the software require Microsoft Windows. Earlier versions of the software had supported other operating systems, but Linux support has been dropped. The full function version is only available under the commercial license because it includes royalty bearing, licensed materials from the American Dental Association (ADA), the Code on Dental Procedures and Nomenclature (CDT).