3D Viewers

Parts HPGL
Allows you to view and zoom in and out of CAD drawings over the Web.

Calculators / Data plotters

calculator
This fast-loading, free applet computes powers, multiplies, divides and summarizes.

ConversionApplet
The free ConversionApplet enables visitors to convert units of measure from one to another. Converts length, Temperature, Area, Volume and Mass.

DueDateCalculator
Pregnant? Or know someone who is? This simple utility will calculate estimated due date as well as expected length and weight. Source included!

EuroCalc
The free EuroCalc applet allows users to convert numbers/calculations from/to European; features a digital displayer and real calculator.

exbal
This Chemical Equation Balance Calculator is very flexible in balancing chemistry equations.

Geodetic2
This pop-up applet allows you to calculate the distance between any two points in the world. Source included!

GraphApplet
Graph applet is a Graph Drawing Calculator with advanced features, including juxtaposition, which means you can write your expressions just as you would on a piece of paper.

PocketCalc
This freeware applet simulates a basic pocket calculator. Source included!

SimplePlot
Plots simple two-dimensional functions according to user specifications. Source included.

Data Viewers

Chart
A parameter-based bar chart. Parameters can be set dynamically from a cgi or JavaScript. Source included!

EasyCharts
An excellent data display tool. Extremely configurable bar graphs, pie charts, and line graphs. Source is included and it's all extremely well documented.

Iruvar
This applet reads a file which contains two lists of items which have one to one relationships. Example - States and Capitols.

MktView
This sophisticated applet reads stock data from a server (which you need to supply) and graphs the daily information based on settings you determine. Source is included in the zip file.

NF4
Draws line graphs, bar charts, or pie charts according to user-defined parameters. Source included!

PieChart
A customizable pie chart generator. Just load your data into the parameter tags. Source included!

Fractal Viewers

Julia
Generates a Julia Set when a complex number is chosen from an image of the Mandelbrot Set. Source included.

Mand
Navigates around the Mandelbrot fractal. Source included.

Simulators

BallDrop
Tiny balls drop to form a normal, bell-shaped distribution. Source included.

Graph
The classic network-mapping applet from Sun Microsystems. Source included!

PatternSimulator
A simple aircraft runway approach simulation, with source included.

particleTree
This applet demonstrates how recursion and randomness can simulate natural patterns such as the branches of a tree or the paths of particulates in the air. A good applet to study for beginning programmers.