Maths Blocks
Visual blocks for mathematical syntax

Maths Blocks: A visual mathematical expression builder

Maths Blocks is a system for constructing and manipulating mathematical expressions from visual blocks representing syntactical elements.

Try it out:

Maths Blocks is based on the Blockly project. Source is available at Github. Gratefully using code and inspiration from Polymorphic Blocks, App Inventor and HenrikD's Blockly plugins.