PlanetsCentral

If you want a "maximum number of alliances" add-on (such as POneAlly, CMLimit) we can give that a try. Otherwise, alliances are not limited.

Personally I would always prefer a gentlemen's agreement instead of enforcing it by some kind of add-on. But if this is a possible solution I'd take it.

According to what at0mix wrote it is apparently very common to form circles of alliances, i.e. 1+2, 2+3, 3+4, 4+1. This way no player officially has more than 2 alliances but of course there is cooperation between all of them. Therefore I'd go with the POneAlly add-on.

Of course this disables official alliances only, there is no way to hinder two players to cooperate if they want to. This leads me back to my introductory sentence. If we could all agree not have multilateral alliances of more than 3 players there would be no need for an add-on or for monitoring that everybody's complying with it.

More opinions?