Conversations.im - XMPP client designed with ease of use and security in mind
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.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
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.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
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.