Coliberator is an international conference about free technology, and free culture.
It is organized by Fundația Ceata. Its first edition was in 2013. The place where the conference takes place is Bucharest, Romania. Until 2016 it was organized in the beginning of June. Starting 2017, it will happen in the autumn, at the beginning of October.
The main tracks are:
When we say "free" or "libre", we mean that the users of those programs, formats, or devices have the freedom to use, modify, and redistribute them, for any purpose (including commercial).
You can read further about this, and about the four freedoms on the GNU Project's website.