EasyPLC Sofware Development Kit
The S.D.K. is one of the EasyPLC extensibility tools.
Through this system, any user with programming skills can develop their own communication libraries between any hardware device, any software or utility and EasyPLC.
To develop your own driver you can access the various tutorials that are available in the forum or help documents that come with the registered version of EasyPLC.
To create a driver you can use the Microsoft Visual Studio C# Express Edition, freely downloadable from the Microsoft web site.