Web Smart Farmer is a Web Based System to help the farmer to view their field soil variability maps and keep the record of their farming activities through a web portal and take remedial actions using variable rate treatment of their management zones with the help of "rice check" available on-line. The system also allows farmers to keep the record of their farming activities such as amount and cost of fertilizer and chemical uses. The system finally will determine the profit of their farming based on Return of Investment (ROI). This will enhance the farmers' understanding on their cost of productions and real profit being gained by them for each particular season. The target group for these systems is for the farmers and farm managers. The farm manager can view which lot produce highest yield with the lower cost of expenses. This will help the managers to determine which lot with the low produced yield and overcome the problems. This system has the potential to be used in the granary area and also by the government agencies involved in the national rice industry like MADA, KADA and others. Because of the use of open-source technologies, the cost for development of this system is reduced.