Make no mistake, though they are developed to demonstrate how to design and develop application, they
contain what you need in real-world applications. In some cases you can copy the code from these projects
and make a change or two (may be none) to use them in your live projects.
Project FAQs and Project to be done
Java SE and EE Projects With Source Code
ASP.NET Project With Source Code
.NET Windows Application Using VB.NET