Base allows the creation and manipulation of databases, and the building of forms and reports to provide easy access to data for end-users. (LGPL)

DataKiosk provides a series of wizards that allow you to build a custom Juk-like interface for any SQL database with a QtSQL driver. (GPL)

With Glom you can design database systems - the database and the user interface. (GPL)

Kexi is an integrated data management application. It can be used for designing and implementing databases, data inserting and processing, and performing queries. (LGPL)