Matrix Calculator (Java Application) UPDATED: 2005-06-30
A Java application which lets you calculate the determinant, adjoint, inverse, transpose, and more of a 'n x n' matrix. (Source Code Available)

Linear Algebra Calculator (JavaScript)
A matrix calculator, which has the ability to calculate the determinant, adjoint, and inverse of a '3 x 3' matrix.

Linear System of 3 Equations (JavaScript)
A calculator that can solve a linear system of 3 equations and 3 unknowns, includes explanation on the mathematics behind it.

The Mathematics Behind Them.
A brief introduction to linear algebra mathematics explaining the functions and theorems used in the matrix calculators.