GeoGebra
I always keep an eye out for software that makes diagramming easier, and the other day I came across GeoGebra. GeoGebra is a fantastic, free (as in freedom), Java-based mathematical illustration tool that includes support for plotting functions.
Similar to Mathematica Player, diagrams are fully interactive and can be exported as embeddable Java applets.
Perhaps best of all, no installation is required. GeoGebra launches through WebStart.
Here are few examples that I whipped up:
Example 1: Circle Square Screenshot
Example 1 (Click to Launch Applet)
Example 1 (Download GeoGebra Project)
Example 2: Circle Arc Screenshot
Example 2: (Click to Launch Applet)
Example 2: (Download GeoGebra Project)
Example 3: FM Modulation Screenshot
Example 3: (Click to Launch Applet)
Example 3: (Download GeoGebra Project)
Example 4: Darboux Integration Screenshot
An example of Darboux integrals.
Example 4: (Click to Launch Applet)
Example 4: (Download GeoGebra Project)
More examples can be found on the GeoGebra wiki.
Download the GeoGebra source, here.
