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This webpage displays a graphical solution to a second-order, constant coefficient equation with a constant coefficient cosine forcing function.
This is an applet of the graphical phase plane of about ten different 2nd order systems of 1st Order ODEs. The applet requires download of the Wolfram Demonstrations Project (120MB)
The odetoolkit lets you enter a first order ode or system in normal form and then solve the initial value problem numerically, presenting the results either graphically or in tabular form.
There are 58 applications of differential equations over four pages on the site. You can download the Maple worksheet as well as a description of the worksheet.

This applet allows one to change the frequency of two waves between 5 and 20 Hz with a slider scale as well as classify the waves as in or out of phase. You obtain the wave motion over time.

This site contains notes for a variety of elementary differential equations topics.  Headings of major sections include: first order, second order (including series solutions
This webpage displays fully-worked examples showing the solution of a first-order linear inhomogeneous differential equation with constant coefficients.
This webpage displays fully-worked examples showing the solution of a first-order Bernoulli differential equation with constant coefficients.
This Mathematica Demonstration considers a single initial value problem for a single Cauchy-Euler equation.
A Java applet that allows one to interactively analyze (graphically) second order differential equations.

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