Estru3D is described as 'SourceForge presents the Estru3D project. Estru3D is an open source application. SourceForge provides the world's largest selection of Open Source Software. Structural analysis using the Stiffness Matrix' and is an app in the development category. There are more than 25 alternatives to Estru3D for Windows, Mac and Linux. The best Estru3D alternative is SAP2000. It's not free, so if you're looking for a free alternative, you could try FRAMEWORK 2D+3D or Structurix. Other great apps like Estru3D are St, MASTAN2, Analysis for Windows and sas-civil.