Tlen.pl
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Tlen.pl is a free-of-charge Polish instant messaging service. It is currently the second most popular utility for instant messaging in Poland after Gadu-Gadu, with which it is fully compatible.
The communication protocol is based on open source jabberd code, but it was modified significantly. Among other features not present in jabberd, Tlen.pl allows for voice chats, SMS sending and video conferences. The versions later than 4.0 allow for creation and usage of plugins. Since then more than 80 plugins were created by the community. By April 2006 there were more than 1 000 000 registered users of Tlen.pl. It is also integrated with the o2.pl mail system, which allows user to use mail in three domains: o2.pl; go2.pl and tlen.pl. It is possible to get acces to mail system from application easily. Tlen.pl automatically checks user account and if there is any new mail, it shows notification on screen.
Also it is possible to connect to Tlen.pl with a browser from Tlen.pl homepage.
Since version 6.0.1.7 Tlen is delivered with Tlenofon plugin, which enables VoIP functionality to the client. Tlenofon is similar to Skype service and offers low-priced calls to Poland and other countries.
