We have studied modular self-reconfigurable robots that are capable of changing their overall shape and functionality by automatic recombination of homogenous robotic modules. Our latest model, called Modular Transformer (M-TRAN), is able to metamorphose into various 3-D configurations and generate robotic motions that are suitable to its configuration. This paper presents a review of hardware design of the module, some developed software for selfreconfiguration and motion generation, and some experimental results.