Skype

Skype came much early than its competitors and provides both voice and video based communication service. The service is free but a fees needs to be paid to call from Skype to phones over mobile operators. It is available across multiple platforms including Microsoft Windows as well as Linux.

Viber

Viber came much early than WhatsApp and provides more features than several instant messengers available. It has additional features that includes Viber Games and allows public chats. It has the facility to call non-Viber users at a minimal cost but for users its totally free.

Also Read:

10 Best Mobile Payment Services Available Now

WhatsApp In Talks To Bring In B2C Chat Option