Need help finding an old game

I've been racking my brain trying to remember the name of this game I used to play several years back. It's a free download client that connects you to a series of servers.

The gist is economics. You set up shop on a hexagonal grid next to other 'companies' and earn money through supply and demand. There are all sorts of different items you can manufacture, mine, or otherwise sell for profit.

Pretty much you get a group of 5 - 6 people and form a 'corporation' where all 6 of you supply goods interchangeably to make money.

Bit sparse on the details but this is all I can remember. Any help would be appreciated.