Complex software of computational Grid

The development of advanced software implementing the Grid approach facilitated creation of the computational infrastructures that integrate spatially distributed (on a global scale) computer installations. Resources of such infrastructures are shared by large collectives of specialists in different scientific areas. The paper presents the analysis of the grid platforms — the most complete form of contemporary grid software. The main issues discussed are: forms of computing with distributed computer, file and information resources; program methods of resource integration; support technologies for grid operation and virtual organizations. Results of the research reveal, that the existing grid program platforms can serve as a basis for the distributed applications of mass character, capable of comprehensive maintenance of professional activities in various spheres of business, production and management.