# SQLAlchemy 0.8 Documentation

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Release: 0.8.2 | Release Date: July 3, 2013

# ORM Extensions

SQLAlchemy has a variety of ORM extensions available, which add additional functionality to the core behavior.

The extensions build almost entirely on public core and ORM APIs and users should be encouraged to read their source code to further their understanding of their behavior. In particular the “Horizontal Sharding”, “Hybrid Attributes”, and “Mutation Tracking” extensions are very succinct.

- Association Proxy
- Declarative
- Mutation Tracking
- Ordering List
- Horizontal Sharding
- Hybrid Attributes
- Alternate Class Instrumentation