Mathematical Graphing

Advanced Grapher
Graphing, curve fitting and calculating software. Plot high-quality 2D graphs of equations, inequalities and tables. You can also perform regression analysis and various calculations. [Win 95/98/Me/NT/2000]
http://www.serpik.com/agrapher/

Chartist
Enables the user to create, edit, and print flowcharts, organization charts, or other diagrams that use similar components. [Win95/98/Me/NT/2000]
http://www.novagraph.com/

Mathematics on PC 1.0
Shows a graphical representation of any surface and 3D object, and can also perform a calculation of the area under the graphic of any function on any interval, with graphic representation. [Win 95/98/NT]
http://vrapcea.tripod.com/mathonpc.html

Numerit
An intuitive programming environment for developing numerical computation programs and producing publication quality documents. built-in scientific word processor which allows insertion and formatting of text, graphs, tables, pictures, and equations. [Win 95/98/Me/NT]
http://www.numerit.com/

Plot Maestro
A plotting program but also allows you to plot graphs using graph paper. Support for plotting data sets of x, y data pairs. Calculate and plot the best-fit curve to the data set using linear, exponential, logarithmic or power curve fits. [Win 95/98/NT/2000]
http://www.rredware.com/pmdetails.htm

RFFlow
Turns your ideas into a variety of flowcharts, organization charts, and diagrams for documents, presentations, or the Web. [Win95/98/Me/NT/2000]
http://www.rff.com/

SimplexNumerica
Object-oriented numerical data analyzer and plot and presentation program. Software is suited for publication type graphics, analysis of arbitrary data, analysis of measuring data. Wide-ranging library of 2D and 3D diagrams with a large section based on approximation and interpolation algorithms. Samples provided.
http://www.simplexnumerica.com/