Open Source ORM Projects

Object-relational mapping (ORM) tools connect application code to relational databases by representing tables and records as familiar programming-language objects. They can reduce repetitive SQL, manage database connections, and provide ways to query, create, and update data. Many also support schema migrations, transactions, and relationships between tables, helping teams work with database-backed applications while keeping data access organized.

Open source ORM tools range from lightweight query layers to full-featured frameworks with schema management and validation. When choosing one, consider its supported languages and databases, licensing, maintenance activity, documentation, performance needs, and fit with your application’s existing stack. Check how it handles migrations, complex queries, and database-specific features. ORMs are useful for developers and teams building applications that need maintainable, consistent access to relational data.