SendSMSnow - SendSMSnow is one of the best services over the internet that lets the users to send free SMS in any part of the world in addition to India.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
AFreeSMS - AFreeSMS is a free web-based service that allows you to send unlimited free SMS messages online, no need to register, just type your message and send unlimited SMS to anywhere around the world for free.
Ettercap - Ettercap is a suite for man in the middle attacks on LAN.
Indyarocks Free SMS - Indyarocks Free SMS is listed among the most popular websites in India that offers their users to send as many SMS as they want.
tcpdump - tcpdump is a common packet analyzer that runs under the command line.