AUDIOCALC
Talking Scientific Calculator, Speech responses for all keys.  Learning methodology allows user to find function keys without interrupting calculations in progress.  Features:  square root, degree, radian, sine, cosine, tangent, etc.  Auto start & stop.  Informational website: http://www.maxiaids.com 

TI-84 Plus
Graphing Calculator with USB port for computer connectivity and unit-to-unit communication. Informational website: http://education.ti.com/educationportal/

FX-55 Calculator
Features fraction functions along with pre-algebra capabilities. Informational website: http://www.calculatorsinc.com

SL-450 Calculator
Calculator for basic math.  8 digits LCD display. Informational websites: http://www.calculatorsinc.com

FX-65 Calculator
Features a true fraction display that shows up to 10 digit mantissa + 2 digit exponent.  Informational websites: http://www.calculatorsinc.com

Scientific Notebook
Scientific Notebook is an easy-to-use word processor that completely integrates writing mathematics in natural notation. Entering text and mathematics is straightforward. Formatting is fast, simple, and consistent with tags that defie the document structure and appearance.  Informational website: http://www.mackichan.com