From #openttdcoop wiki
Our community #openttdcoop consists of two servers:
The mainserver: feel free to watch us playing: search for the server name "#openttdcoop". The password needed to join as a watching client is "coop". Playing access (company password) is granted to many people, see Membership for further details.
For a list of games which took place on our mainserver, look at Mainserver:Archive
rcon on the mainserver is granted to every full member of #openttdcoop.
The Sandbox: if you heard of #openttdcoop and would like to make the first steps toward a membership in our community, simply read what you have to do at Membership and Sandbox_Server. Feel free to join our community of aspirants for #openttdcoop membership.
For a list of games which took place on our sandbox server, look at Sandbox:Archive
rcon on the sandbox server is granted to every full member of #openttdcoop and our apprentices who have access to the mainserver.