Analysis for Windows is described as 'Powerful Finite Element Analysis package for 2D and 3D constructions (frames and trusses)'. There are more than 25 alternatives to Analysis for Windows for Windows, Mac and Linux. The best alternative is SAP2000. It's not free, so if you're looking for a free alternative, you could try MASTAN2 or St. Other great apps like Analysis for Windows are FRAMEWORK 2D+3D (Free), Structurix (Free), Estru3D (Free, Open Source) and sas-civil (Free, Open Source).
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.
DIANA is an extensive multi-purpose finite element software package that is dedicated, to a wide range of problems arising in Civil engineering including structural, geotechnical, tunnelling, earthquake disciplines and oil & gas engineering.
SourceForge presents the FEMTA project. FEMTA is an open source application. SourceForge provides the world's largest selection of Open Source Software. Easy to use 3D truss analyzer using finite element methods.