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Great Expectations (GX Core)

Great Expectations project (open-source stewardship by Fivetran) · Data quality & validation

Python data-quality framework that declares Expectations about datasets, validates them against pandas, Spark or SQL sources and produces Data Docs

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

Instructor

Jason Liu and contributors (567 Labs) · Agent frameworks & orchestration

Python library for extracting validated structured data from LLM responses using Pydantic models, with automatic retries, streaming partials and support for many providers

MITOpen sourceFreeLocalNov 2, 2026

Pandera

Union.ai (Pandera project, created by Niels Bantilan) · Data quality & validation

Lightweight Python library for declaring and validating DataFrame schemas for pandas, Polars, PySpark and other backends, with type-hint style models

MITOpen sourceFreeLocalNov 2, 2026

Pydantic

Pydantic Services Inc. · Data quality & validation

Python data-validation library using type hints to parse, validate and serialize models, with a Rust core; the schema layer behind FastAPI and many LLM SDKs

MITOpen sourceFreeLocalBroken

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