Skype is an instant messaging and VOIP (Voice Over Internet Protocol) client to communicate with people in a distant place.

ooVoo is a video chat and an instant messaging client.

Flock is a communication app for teams. Packed with tons of productivity features, Flock drives efficiency and boosts speed of execution.

ICQ is an open source instant messaging software.

BlackBerry Messenger, also known as BBM is an instant messenger and videotelephony application included on BlackBerry devices that allows messaging and voice …