CurvFit

It is a well-known fact that most algebraic curves and equations can be solved or explained using a simple piece of paper or a blackboard, but by far the easiest way is to use a computer.
CurvFit is a handy piece of software that aims to provide you with all the necessary tools and a suitable environment for curve fittings. This said, the utility makes it simple for you to build and simulate mathematical functions, equations or curves.
Provided you already have Microsoft Visual Basic Runtime installed on your computer, you can start using the app immediately, right after a simple installation process.

Organized layout and straightforward interface

CurvFit's interface is miles from being called stylish, as it features an old-school look that would be more suitable for past versions of Windows than for latest ones. Nevertheless, the main window of the app makes it rather simple to access CurvFit's main features.
Besides enabling you to input the parameters for your non-linear curves, define the control variables and calculate complex math models, the tool also comes with a dedicated Tips/Suggestions tab.

Suitable for academic purposes

Probably the most important thing about CurvFit is its ability to create algebraic series of data such as Sine, damped Sine, Lorentz, Modified Lorentz, Power (Polynomial) and Exponential.
In addition, its features favor problem-solving descriptions like electrical filter design, pulse slimming, AC motor design, digitized a signal from magnetic recording and even pharmacokinetics.
This, coupled with its provided documentation clearly recommend it especially for academic and educational purposes.

Uses DOSBox to render the calculated curve

After you have entered all the parameters for your mathematical functions, you need to simply run your demo from the dedicated tab or from the Demos menu. No need to panic, as the application opens some new windows and automatically runs a DOS program using the DOSBox emulation utility.
With the help of the DOSBox, the app basically generates the resulted curve fitting. Within the window that encompasses the curve fitting, you can either visually observe it or adjust its color setup parameters and X,Y axes values.

Comprehensive learning tool with broad academic applications

All in all, CurvFit is an efficient software solution for curve fitting and even more so a very comprehensive learning tool. It may not be modern-looking, but it provides extensive documentation and does not overcomplicate things, like most apps of this sort often do.