Here's the current version of a web page based on Henri Gourvest's glpk.js (and with a lot of generous help from Henri) that I'm developing for a course this Spring. The goal is a small footprint, 'zero-install', cross-platform tool, for teaching the application of OR methods to business and operations. I'm still sorting out some bugs with the menus, but thought there might be some interest in this.
Note that glpk.js is doing all the work within the browser. You can cut and paste your own models into the edit window or load them from your local files. The 'aha' moment for me was solving a MathProg model on my phone (iPhone 4S w/Safari) and iPad (the menus are really broken under iOS, but glpk.js appears to work fine.)
Certainly welcome feedback.
Jeff