Apps with 'Variables' feature
SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and a extensive list of features, including: Unlimited Variables,
A powerful REST API Client with cookie management, environment variables, code generation, and authentication for Mac, Window, and Linux.
Qalculate! is a multiplatform multi-purpose desktop calculator.
A REST client for almost any web service (Firefox and Chrome extension).
Chalk is a calculator that tries to do right what others do wrong. It wants to prove that a "basic" software calculator can be as handy as a real desktop calculator.
Powerful IDE to work with API. Harness the power of scenarios, autocompletion and syntax highlight for API development. Write tests, share code without leaving the comfortable development environment.
PlainCalc is a buttonless, algebraic-entry, mathematical calculator with variables.
Standalone parallax scrolling for mobile and desktop with CSS variables.No screenshots yet
A web based calculator with a clean interface that allows commenting, creating variables and more. The website also provides more tools like converter, VAT calculator, and more.