PhET provides fun, free, interactive, research-based science and mathematics simulations. The simulations are written in HTML5 and can be run online or downloaded to your computer. All simulations are open source. (from the product's site)
Online WYSIWYG Editor to write and share mathematics:
- Quickly insert mathematic symbols with Suggestion Box
- Tools to draw graphs or diagrams, and export to SVG
- Import/Export Latex for Math Mode
- Share documents with people
