Swift Calcs is described as 'The Collaborative Computational Notebook Built for Modern Engineering. Enter math as it appears on paper, get instantaneous results, and share your calculations with colleagues and clients. No special syntax, no software, no headaches, no kidding' and is an website in the Education & Reference category. There are more than 25 alternatives to Swift Calcs, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and Android. The best alternative is LaTeX, which is both free and Open Source. Other great sites and apps similar to Swift Calcs are MATLAB (Paid), Overleaf (Freemium, Open Source), Mathematica (Paid) and fxSolver (Free).
Mathics is a general purpose computer algebra system (CAS) and designed to be a free, light-weight alternative to Mathematica. It's programmable using a Mathematica like language and uses a web interface for user interaction.
Getting your research published is tough. You face complex author guidelines, painful citation formatting, messy email collaboration, frustrating word templates, and long drawn submission processes. The good news? Typeset makes it easy.
Calculist is an open source application that facilitates effective thinking. Write down your thoughts, ideas, and data in the form of lists. Focus your attention by zooming in to a specific list, and zoom out to see the broader context.
WIRIS cas is an online platform for mathematical calculations designed for education. You can access a powerful calculation toolbar through an HTML page that includes integrals and limits calculation, function graphing in 2D or 3D and symbolic matrices manipulation, among others.