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

Beamium is an online tool to present and share documents live.

Tencent QQ (QQ) is an instant messaging software service.

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.