Math Mechanixs
Math Mechanixs is an easy to use general purpose FREE math software program. (FREE registration is required after 60 days). The typical tool for obtaining answers to a mathematical problem has been the calculator. Unfortunately, a calculator can be very limiting. ... Until the graphing calculator, the user could not graph their data either. ... s display (in full color), and export the graph to other applications. ... You can also add point labels, zoom, rotate and translate the graph. ... You can save and export your graph for use in other applications too.
http://www.mathmechanixs.com/download/mathmech10021.exe - 6Mb - Download - Screenshot

MadCalc
MadCalc is a full featured graphing calculator application for your PC running Windows. With MadCalc you can graph rectangular, parametric, and polar equations. Plot multiple equations at once. Change the colors of graphs and the background. Use the immediate window feature to evaluate complex... Students can use it instead of that tiny calculator screen while you are doing your calculus homework. ... MadCalc allows you to zoom in and out on graphs or set the scale in terms of x and y explicitly or scroll just by clicking on the graph and dragging it.
http://www.madlogic.com/download/MC_INST.EXE - 387Kb - Download - Screenshot

DreamCalc Graphing Calculator
DreamCalc is the smarter alternative to a hand-held Graphing Calculator for your PC or laptop! You'll get the intuitive feel and productivity of using a professional hand-held, but one which adapts to your way of working. With DreamCalc, you'll be able to graph functions and plot list data more... Select from Reverse Polish Notation or two styles of algebraic input, and with the optional ability to run in your Windows system tray--DreamCalc will always be there whenever you need to reach for a calculator.
http://www.dreamcalc.com/downloads/dc3g_setup.exe - 3Mb - Download - Screenshot

MathCalc
MathCalc run with the calculator and graph plotter mode. Within the calculator mode, you can compute mathematical expressions, trigonometric, hyperbolic or logarithmic functions. The entered expressions and functions are saved into formula lists. The program has a handy, easy-to-use formula... In addition, it is possible to export the graph points to a text file. ... MathCalc supports adjusting of all chart elements in the real time mode (WYSIWYG - What You See Is What You Get). ... The graphs plotted, you can edit, save, print out and export to files of graphics formats (BMP, WMF or EMF).
http://www.ypssoft.com/program/matce2_1.zip - 1Mb - Download - Screenshot

Advanced Grapher
Powerful but easy-to-use graphing, curve fitting and calculating software. Graphs Cartesian (Y(x) and X(y)), polar and parametric functions, graphs of tables, equations (implicit functions), inequalities and slope fields. Up to 100 graphs in one window. ... Lots of graph and coordinate plane parameters. ... Calculus features: regression analysis, obtaining zeroes and extrema of functions, intersections, derivatives, equations of tangents and normals, numerical integration, value tables, calculator.
http://www.alentum.net/files/agrapher.zip - 1Mb - Download - Screenshot

DreamCalc Financial Calculator (Pro)
DreamCalc Professional is the smarter alternative to a hand-held Financial Calculator for your PC or laptop! You'll get the intuitive feel and productivity of using a professional hand-held, but one which adapts to your way of working. With DreamCalc, you'll be able to graph functions and plot... Select from Reverse Polish Notation or two styles of algebraic input, and with the optional ability to run in your Windows system tray--DreamCalc will always be there whenever you need to reach for a calculator.
http://www.dreamcalc.com/downloads/dc3p_setup.exe - 3Mb - Download - Screenshot

ZGrapher
This graphing calculator can plot y(x), x(y), polar, parametric and table-defined functions. All your graphs and coordinate space may be fully customized. You can comment your graphs using labels and legend. For a few seconds you can obtain derivatives, tangents, normals and calculate integrals. ... Results of your work may be exported to Word or saved as BMP, GIF and PCX pictures. ... Regression analysis will help you to find trend of your data.
http://www.zgrapher.com/zgrapher.zip - 621Kb - Download - Screenshot

3D Grapher
3D Grapher is a feature-rich yet easy-to-use graph plotting and data visualization software suitable for students, engineers and everybody who needs to work with 2D and 3D graphs. 3D Grapher is small, fast, flexible, and reliable. It offers much of the functionality of heavyweight data analysis... Other program features include: 1) Built-in expression calculator 2) Mouse cursor coordinate tracking 3) Fully customizable user-friendly interface for highly efficient workflow 4) Ability to import and export data in several popular file formats 5) Ability to copy the graphs and paste them...
http://www.romanlab.com/3dg/3dg.zip - 836Kb - Download - Screenshot

RORICX - Rate of Return Calculator
Calculates the Rate of Return and Net Gain for your portfolio (investment, real estate, rental, etc. ) Any time intervals, positive/negative RoR, regular contribution programs, individual transactions, combined (overall) portfolios, verification window for line-by-line review, graph, report,...
http://members.shaw.ca/lapides/downloads/roricx_download.exe - 605Kb - Download - Screenshot

BitMeter
BitMeter 2 is a bandwidth meter, it allows you to visually monitor your internet connection by displaying a scrolling graph that shows your upload and download speed over time. BitMeter is freeware - ie. it is given away completely free of charge, there is no trial period, no time-limited... Change graph type (bar or line graph). ... Configurable graph scale - set to any value, or set to auto-adjust according to your speed. ... Speed/time calculator. ... Option to display current graph maximum on screen.
http://codebox.no-ip.net/controller?page=bitmeter2dl - 1,011Kb - Download - Screenshot