Downloadable computer software in the field of structural design of offshore structures and civil engineering applications. Computer software for structural analysis and design of offshore structures and general civil engineering applications, namely, software for creation and maintenance of structural models, gravity, equipment and appurtenance modeling and load generation, linear static analysis, soil-pile structure interaction analysis, static condensation analysis for the design of substructures, incremental non-linear static analysis with geometric and material nonlinearities, linear and nonlinear dynamic analysis due to regular waves, random waves; solution of frequencies and mode shapes, earthquake motions and general time-dependent loadings; and spectral and discrete fatigue analysis capabilities for tubular joints, tubular members, steel shapes and plated structures; and random wave fatigue analysis. Computer software for testing, namely, computer software for testing in accordance with API RP 2A and ISO Tubular Members and Joints checks, AISC Check of Steel Shapes; testing in accordance with API Bulletin 2V, DNV 30.1, DNV RP C201 and ABS Stiffen Plate Check; testing in accordance with API Bulletin 2U and DNV RP C202 Cylinder Shell Check; detailing and generation of 3D eccentricities for fabrication of tubular braces; and import and export capabilities to SACS, MOSES, PDMS, ANSYS and XSteel