UPDATE: I don't support this project anymore, the site is down.

PL0T and See the Data http://pl0t.com

A plot document is plain html. You can open it locally or share on any site.

Example:

plot="{chart:[bar,{x: a},{y: b}],data:{a:[1,2],b:[2,4]}}"
curl -s http://pl0t.com/view.html | sed "s/{data}/$plot/" > play.html
open play.html

Language API and more visit http://pl0t.com