The following libraries build on attrs to provide additional functionality or have special support for attrs classes:

• attrs2bin: Binary serializer for attrs-based classes.
• attrs-strict: runtime validation for attributes specified in attrs dataclasses based on the type field provided.
• bfa: Builders for attrs
• cattrs: for structuring and unstructuring data
• cyclopts: for modern, easy-to-use command-line interfaces
• datargs: A paper-thin wrapper around argparse that creates type-safe parsers from dataclass and attrs classes.
• desert: DRY deserialization for dataclasses and attrs classes.
• inline-snapshot: create and update inline snapshots in your Python code.
• marshmallow-attrs: Marshmallow serialization for attrs classes.
• msgspec: fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML – and first-class support for attrs
• prettyprinter: an extensible alternative to pprint comes with attrs support.
• related: for creating nested object models that can be serialized to and de-serialized from nested python dictionaries
• Rich supports pretty-printing of attrs classes.
• serde: a performant serialization / deserialization extension to and from plain dicts.
• spock: lightweight typed and stateful parameter configuration library (mainly for ML) that wraps attrs
• typecats: Make attrs classes act more like structural (rather than nominal) typing; built on top of cattrs.
• valid8: provides an alternate way to add validation to attributes, supporting various coding styles to define your validation functions and validation exception types/messages
• yasoo: Serializes and deserializes attrs and dataclass objects without relying on type hints.