Definitely. I have 2 girls and 1 boy cat and they all get along. After initial problems and with careful treatment most cats will get along eventually, and, even if they are not best friends, they learn tolerance.
They can even get along with unneutored males. I have 2 neutored females and they have befriended an abondoned male that is not neutored. They even allow him into the house and to share their food. Strange! He comes in when he wants, eats, and lounges on the club chair that one of the cats thought was her own.