**Arithmetic**

- Basic Addition Facts Drillmaster (JavaScript): drill and practice on basic addition facts
- Basic Subtraction Facts Drillmaster (JavaScript): drill and practice on basic subtraction facts
- Basic Multiplication Facts Drillmaster (JavaScript): drill and practice on basic multiplication facts
- Basic Division Facts Drillmaster (JavaScript): drill and practice on basic division facts

**Sequences and Series**

- Simple
Recursive Sequences (web
*Mathematica*): input a parameter value and see the graph of an arithmetic, a geometric, or a logistic sequence - Fibonacci
and Related Sequences (web
*Mathematica*): input parameter values and see the graph of a generalized Fibonacci sequence

**Combinatorics**

**Fractals**

- Mandelbrot Scenes and Animations (GIF animation): view zooms at three points in the Mandelbrot set

**Linear Algebra**

- 2D
Matrix Transformations (web
*Mathematica*): input a matrix and see it iteratively transform a simple geometric object - 2D
Homogeneous Transformations (web
*Mathematica*): input a matrix and see it iteratively transform a simple geometric object

**Social Choice**

- Power on the Nassau County Board of Supervisors
- Power on the United Nations Security Council
- Voting
and Power Indices (web
*Mathematica*): input the quota and a set of player weights to see the Banzhaf and Shapley-Shubik power indices - Apportionment
Methods (web
*Mathematica*): input the legislature size and a set of state populations to see the apportionments of Hamilton, Jefferson, Adams, Webster, and Huntington-Hill.

**Statistics**

- Comparing
the z and t Distributions (web
*Mathematica*): input a confidence interval and degrees of freedom and see an animated comparison of the two distributions

**Other**