Space Gass is described as 'SPACE GASS is a multi-purpose 3D analysis and design program for structural engineers. Its extensive range of features make it suitable for anything from beams, trusses and frames to buildings, towers, tanks, cable structures and bridges' and is an app. There are more than 50 alternatives to Space Gass for Windows, Web-based, Linux, SaaS and Mac. The best Space Gass alternative is CalcSteel, which is free. Other great apps like Space Gass are RodX, Robot Structural Analysis Professional, Abaqus Unified FEA and CloudCalc.