DbSchema is a databases client and visual designer. DbSchema has a free Community Edition, which can be downloaded here.
DbSchema main features include:
Design tables, column and foreign keys directly in diagrams.
Choose the database location, the user and password, and simply get connected.
Explore data from multiple tables simultaneously, using foreign keys or virtual foreign keys.
Create SQL Queries using the mouse.
Edit and execute SQL Queries
DbSchema is using the design model, a copy of the schema structure, independent of the database.
The design model can be saved to file and shared in a team.
Connecting to another database you may compare the design model with the database, commit the differences or merge them in the design model.
Configurable styles & dark theme.
Many features are available in the free Community edition.
The Pro edition adds capabilities to save the design to the model file, design schema in team and deploy the schema on multiple databases.
DbSchema can be downloaded for free. No registration is required.