ClearCalcs is described as 'easy to use online structural design and analysis tool for engineers who want quick and accurate calculations for timber, steel, retaining walls, portal frames, and more'. There are more than 10 alternatives to ClearCalcs, not only websites but also apps for Windows. The best alternative is RISA-3D. It's not free, so if you're looking for a free alternative, you could try SkyCiv. Other great sites and apps similar to ClearCalcs are RISA-2D (Paid), Etabs (Paid), SAP2000 (Paid) and STAAD.Pro (Paid).
For nearly 30 years, ETABS has been recognized as the industry standard for Building Analysis and Design Software. Today, continuing in the same tradition, ETABS has evolved into a completely integrated building analysis and design environment.
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.
StruCalc™ is an optimal product for residential and light commercial projects. Our company aims to bring a quality, professional software, built with strict engineering methods and specifications to every business in need of an easy to use, affordable software package.