Try giving them a little less next time. Most animals don't really know when they are full...they'll keep eating until its ALL gone. It worked with my fur balls and they seem fine. Also get some Cat Grass so they can chew on that..it really helps out with health and stomach problems.
Well if its more then one of your cats reacting to the food, then that lessens the chance of something being wrong with all of them. Is it only the food they puke up? Try switching their food, and if they're still vomiting, take them to the vet.
If it only happens on rare occasions, it may be that they have just eaten too fast, try giving the cat smaller amounts at a time. If it constantly happens you might want to visit the vet for a checkup.