University of St. Andrews (UK)
University of St. Andrews: Gaspard Monge
This University of St. Andrews page offers an excellent biography on Gaspard Monge, a French mathematician and diversified scientist (1746-1818.) Discusses his life and his contributions to these fields.
Wolfram Research
Wolfram Math World: Differential Equations
This is a good MathWorld site with links to various topics dealing with differential equations.
Paul Dawkins
Paul's Online Notes: Differential Equations
The tutorial explores differential equations. Topics examined are first order differential equations, second order differential equations, Laplace transforms, Fourier series, higher order differential equations, and systems of...