Mail.Ru Agent is a very popular software in Russia where many young people are using it to keep in touch with their friends and rediscover old acquaintances. You could say it's some kind of Skype for the Russian public. The interface is in that language and the vast majority of its users are young Russians.
The system allows you to use instant messaging and make voice calls through the microphone integrated in the computer or by connecting a phone via USB. In addition, your users can send messages from the computer to their contacts' mobile phones, make video conferences or call landlines anywhere in the world.