Mumble is a free, open-source, channel-based, voice and text chat software.
1. Download and install the Mumble client from
mumble.info
or
here.
2. Add a new server, enter the address "mumble.nexunity.org", any label and your username.
3. Connect to the added server. Alternatively use this
link to connect.
4. For more information see
this video and the
Mumbleguide (English and German).