Operation Research: Simplex Calculator

This sem I'm studying OR (VTU: 10CS661), and I've found a really amazing online calculator (it also has an Android version) that can perform any simplex methods: standard one, Big-M, Two-Phase...

Here's the link to the online calc:

http://www.mathstools.com/section/main/simplex_online_calculator#.VTPWZiGqqko