Calculators and Data Analysis

Scientific Conversions Calculator 
Graphing Applet
Free conversion applet
Free simple plot
Write and plot a function
Virtual Abacus
Roman Numerals Calculator
Graphing Analyzer of Experimental Data
Learn about Functions (linear graphs)
Exploring Graphs and Functions
The Ultimate Graphing tool (graph multiple functions)
Mortgage calculator

Conversion Calculators

length, weight, pressure, volume.
area
temperature
speed