Oxygen is one of the most popular programs in Poland (next to Gadu-Gadu) designed for fast communication over the Internet. The application offers functions such as conducting text, voice and video conversations, support for external protocols (Jabber, Gadu-Gadu), image and file transfer, support for avatars and funny smileys, call encryption, the ability to send free text messages, conduct multi-person conferences and much more. Another advantage of Tlen communicator is very good support for Gadu-Gadu network. Users of Tlena not only have the ability to make text conversations with other users of the largest network in Poland, but also to send them files, pictures, search and add friends to the list of contacts. Another advantage of the Oxygen application is its integration with the Oxygen Phone service, which allows you to make cheap phone calls to people all over the world. Additionally, the functionality of the communicator can be extended by using plug-ins.