I'm a metal gear ***got fanboy so they are from that.
The one of the left is the Shagohod from MGS3, you can only get it with the MGS3 Premium Package. The big thing next to it is the Chrysalis from MGS:PW, and you can get it from most places I think I imported it from Japan off some webstore, Square Enix make them, tbh it's built horribly but the detail is good.