Calculation Laboratory is described as 'online environment for numerical computations. By using this site you get fast access to the easy-to-use tool for computing from anywhere. Calculation Lab is perfect for engineering students' and is an website in the Education & Reference category. There are more than 50 alternatives to Calculation Laboratory, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and Android. The best alternative is GNU Octave, which is both free and Open Source. Other great sites and apps similar to Calculation Laboratory are R (programming language) (Free, Open Source), MATLAB (Paid), Mathematica (Paid) and Scilab (Free, Open Source).
With Euler Math Toolbox, you experience mathematical computations, numerical as well as symbolic, with ease and beauty. The program will display results with nice graphics, which can be exported to files or to web pages, or can be pasted into presentations.
FEATool Multiphysics is a fully integrated Finite Element FEM CAE simulation toolbox for Matlab. With FEATool you can easily model and simulate heat transfer, fluid flow CFD, structural mechanics, chemical reactions, general PDEs, and more.