Scientific Cloud Computing (SCC) applies the advantages of clouds to computational science. The authors present the SC2IT scientific cloud computing tools that abstract complex computational workflows and allow state-of-the-art scientific high-performance computing software to be distributed in a user-friendly manner. They present Linux and Java \"SC2IT\" toolsets to manage virtual cloud clusters and implement scientific workflows. They demonstrate several GUIs that implement the \"SC2IT\" interface for materials science applications. In particular, the cluster manager is a general purpose SCC GUI to which new workflows can be added easily.