Kexi

Rapid Application Development, for handling your database needs

Features

Full visual designers for tables, queries, forms and reports
Running queries, support for parametrized queries
Supports SQLite, MySQL, PostgreSQL and MS SQL Server databases
The only multiplatform graphical tool importing data from MS Access databases
Supports query design in dedicated SQL view
Designing and displaying relational data using combo boxes (lookup columns)
Direct data entry or import using CSV format
Locked down User Mode, allowing you to switch off all commands related to editing your project's design
Many more features

Read more and see many more screenshots on the project's pages.

Information

This section is under construction

Tutorials
Documentation at docs.kde.org (outdated, for 1.1 but mostly the main window GUI differs, other things are nearly the same)