GeoGrid source is available in Java. Source code can be obtained by sending an email to gzhang3[at]cc[dot]gatech[dot]edu. Please state your reason for requesting the source code.
The source code is provided free of charge, on an "as-is" basis. No warranty is offered and no fitness for any particular purpose is guaranteed. By using the source code, you agree that the provider is not liable for any defects or any damages that may result from defects of any kind.