EZSTATES is a contact-management application targeted at freelance real-estate agents.
Example usages:
User adds a buyer/seller
User deletes a buyer/seller
User tracks a listing
User deletes a listing
User sets an appointment
User deletes an appointment
The project simulates an ongoing software project for a desktop application (called EZSTATES) used for managing contact details.
It is written in OOP fashion. It provides a reasonably well-written code base bigger (around 6 KLoC) than what students usually write in beginner-level SE modules, without being overwhelmingly big.
It comes with a reasonable level of user and developer documentation.