Massachusetts Institute of Technology
Mit: Open Course Ware: Honors Differential Equations
The online course consists of educational materials about differential equation theory. Lecture notes, readings, projects, syllabus, exams, and assignments with solutions are included.
Massachusetts Institute of Technology
Mit: Open Course Ware: Differential Equations
The online course consists of educational materials about differential equation. Video lectures, readings, syllabus, exams, interactive mathlets, and assignments with solutions are included.
Harvey Mudd College
Harvey Mudd College: Elementary Solution Methods for First Order Od Es
Elementary Solution Methods for First-Order ODEs: Contains a large amount of information regarding first order differential equations, including definitions, examples, and basic properties.
Wikimedia
Wikipedia: Differential Equation
An encyclopedia article on differential equations discusses ordinary differential equations, how differential equations are solved, and uses of differential equations. The site has many links to clarify topics.
eFunda
Efunda: First Order Ordinary Differential Equations
This site from Efunda provides a defintion and examples of the use of first oder ordinary differential equations.