Offtopic. For those interested in math, the Wolfram Programming Cloud is available free of charge (larger deployments are fee-based). Open a web browser, write some Wolfram Language code, and deploy it to the cloud as an API that anyone can access.
http://www.wolfram.com/programming-cloud

Some cool examples
http://www.wolfram.com/language/gallery/

Getting started with the Wolfram Programming Cloud
https://www.youtube.com/watch?v=BCHsvowZuaE

Fast introduction for programmers
http://www.wolfram.com/language/fast-introduction-for-programmers/interactive-usage/