The green caterpillar on top is an Orange-Barred Butterfly Caterpillar.

The Green caterpillar to the left, and the yellow one to the right are Cloudless Sulphur Butterfly Caterpillars.

Below, the yellow caterpillar in the foreground is an Orange-Barred, and the greenish one behind it is a Cloudless. How green or yellow they are depends on if they've been eating the yellow flowers or the green leaves, it does not help you determine which type of caterpillar they are.