सिग्मा एक व्यवसायिक अनुप्रयोग है जो उपयोगकर्ताओं को उनके संगठन का प्रबंधन करने की अनुमति देता है

Sigma Communications is a free Business application that allows users to work with sales order, purchase order, inventory management, payment follow-up, customer management and Vendor Management. This application is useful for field sales executives. With the help of this application you can manage on-field sales and service order related activity.

It allows the service executive to take service/support requests, message request in the field and provide instant service to the customers.