Astrodon
Home
http://www.astrodon.com/

Aom-Sun Limited
Manufacturer and exporter of calculator such as pocket size calculator, desk top calculator, scientific calculator and portable audio and video products.
http://www.aomsun.com

Lee Handerson
Manufacturer and exporter of desktop calculator, game calculator, pocket calculator, currency converter, databank calculator, as also produces clock and gift set.
http://www.leehanderson.com/

Handy Programs
Measurement Conversion Software, Metric to English, English to Metric, Temperature conversion, Investment calulation software, Mortgage calculation software, Angle calculation software, Reminder Software
http://www.handyprograms.com/

Scientific calculator with graphing capabilities
Fornux PowerCalc-GX is a powerful scientific graphing calculator for Windows that can graph 2D, 3D functions, bar charts and scatter plots, supports rpn notations and offers many mathematical functions for statistics, vector and linear algebra.
http://www.fornux.com

Pattern-Making Calculator
Basic Patterns For Apparel Design
http://pattern.stringcodes.com/

TiePie engineering
TiePie engineering develops and manufactures PC based oscilloscope and data acquisition products. Turn your PC into an Oscilloscope, Voltmeter, Spectrum analyzer, Transient recorder and Function generator just by plugging in a cable.
http://www.tiepie.nl/

Machinist's Calculator
The Machinist’s Calculator has been developed to quickly solve common machine shop trigonometry and math problems at a price every machinist can afford!
http://www.machinist-calculator.com/

Constructive Reals Calculator
An RPN calculator applet and supporting Java library.
http://www.hpl.hp.com/personal/Hans_Boehm/crcalc/CRCalc.html

Jason's Calculator
Get Jason's Calculator at SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory. This is an easy to use calculator for free! It does conversions of all kinds! decimal
http://sourceforge.net/projects/calculator123/