Summary
  
Official Web Site
- Equation Editor is a tool that comes as an optional component with Microsoft Word.
- Math Type is an upgrade from Equation Editor - with many more features and functions.
- a comparsion between MathType 5 for Windows and Equation Editor from the Design Science web site
- Math Type is the currently the most popular equation editor. 		 

Official MathType Site

Download
Review and Evaluation
Price

download MathType 5 for Windows 30-day Evaluation
a very extensive review of MathType v5
MathtType 5.1 for Windows
Academic Discount: $99


MathType 3.7 for Macintosh
MathType 3.7 for Macintosh
Academic Discount$99

images and information obtained from the Design Science website