General EngineeringMaterialsFiltrationSoftwareFree 3D modelsToolsThe Engineering Toolbox: Tools and Basic Information for Design, Engineering Efunda: For Engineering Formulas Discover Engineering Matweb Convertunits Amesweb: Advanced Mechanical Engineering Solutions Pipe flow calculationMatmatch UlprospectorFiltration Filter pressCommercial software SolidWorks Solid Edge AutoCAD Autodesk Inventor CATIA Free software Edrawing FreeCAD DraftSight Calculation Risa 3D3D contentcentral Grabcad TracepartsEquipment for a site survey: Headlamp Caliper