ChartDB

ChartDB is a free and open-source database schema diagram visualizer that enables users to design and visualize their database schemas using a single query. It's specifically built to assist developers and database administrators in creating and managing relationship diagrams with ease. As an alternative, tools like dbdiagram.io, QuickDBD, DrawSQL, and SchemaSpy offer similar functionality—ranging from lightweight diagramming to advanced schema documentation, though not all are open-source or free.

Key features include:

• Instant Import: Visualize your database schema with a single query.
• Database Support: Supports popular DBMS like MySQL, MariaDB, PostgreSQL, Microsoft SQL Server, and SQLite.
• Export SQL: Generate clean DDL scripts in your preferred SQL dialect.
• Team Collaboration: Real-time collaboration features for teams to view and edit diagrams together.
• AI Diagram Assistant: Use AI to assist in diagram creation and management.
• DBML Editor: Support for DBML (Database Markup Language) for defining and managing database schemas.
• Cloud and Self-Hosted Options: Offers both cloud-based and self-hosted deployment options.

ChartDB is useful for:

• Visualizing existing database schemas.
• Designing new database structures.
• Generating DDL scripts for database creation and migration.
• Collaborating with team members on database design.
• Creating documentation for database schemas.