Interesting project! It's nice to see some better examples for this sort of thing. At work I've helped build something similar using javascript. We needed so

Interesting project! It's nice to see some better examples for this sort of thing. At work I've helped build something similar using javascript. We needed something that works in-browser, and have since made sure it also works within web-workers as well as node. It's not as nice as directly running calculations from a magically scalable and performant spreadsheet black box, but importing data and formulae from various spreadsheets has gotten quite easy. Closed source, but imagine using the core and expressions support from mathjs [0] and crossfilter [1] together to display both raw and calculated data in various contexts, and you wouldn't be too far off the mark. [0] http://mathjs.org/ http://mathjs.org/ [1] http://square.github.io/crossfilter/ http://square.github.io/crossfilter/ [edit for grammar]