SmartSniff - SmartSniff is a packet sniffer that capture TCP/IP packets and display them as sequence of conversations between clients and servers.
Jasmin SMS Gateway - Jasmin is a very complete open source SMS Gateway with many enterprise-class features such as:
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
Kannel - Open Source WAP and SMS Gateway
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
Bulk SMS Services - Sending Bulk SMS to the customers will engage the customers with your business and new offers.