We run a Teamspeak Server for communication.

You find Clients for Windows, Linux and MacOS at http://www.goteamspeak.com/?page=downloads.

#openttdcoop.ts

Host: ts.openttdcoop.org (hosted by http://openttd.dihedral.de)

Port: 8767

Password: coop (connect as Anonymous - but please do connect with the same 'nick' as on irc or ingame)

Language: English