WebAssign is a versatile, web-based homework service for educators who want to offer expanded learning opportunities to their students. WebAssign delivers, collects, grades, and records customized homework assignments over the Internet. You can generate assignments with different numerical values, so each of your students is provided with a unique question to solve.
If you are using one of the many popular textbooks supported by WebAssign, you can offer pertinent exercises and problems that relate directly to the lesson at hand. You can write your own questions, or use questions that your colleagues have found successful.