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Top 23 Python OpenAPI Projects
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Project mention: Running a Local LLM on an Older Computer: A Simple Home Lab Guide | dev.to | 2026-09-03
Tools such as Open WebUI, LibreChat, and AnythingLLM can connect to Ollama and provide a browser-based chat interface.
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Kargo
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// search("how do I add middleware") {"source_id": "issue_3027", "score": 0.0164, "snippet": "# How to add a header field to the request in a middleware?", "url": "https://github.com/fastapi/fastapi/issues/3027"} // search_code("def jsonable_encoder") {"source_id": "fastapi/encoders.py#jsonable_encoder", "score": 1.0, "snippet": "fastapi/encoders.py jsonable_encoder", "url": "fastapi/encoders.py#L129-L192"} // who_knows("dependency injection") {"author": "sneakers-the-rat", "score": 5.0, "issues": ["issue_13399"]}
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Project mention: Removing React.js from the codebase and adapting Htmx for UI interactivity | news.ycombinator.com | 2026-07-27
Using Django w/ frontend frameworks has been a struggle for me. (I only dabble as a hobbyist.) I think splitting the backend off into a restful API makes the marriage work. I've looked at django-rest-framework (https://www.django-rest-framework.org/) and django-ninja (https://django-ninja.dev/). Of course,, then you're discarding a lot of batteries that come with the django framework. Perhaps using Django templates for admin / internal facing work only, and React for customer-facing sites can be a healthy compromise?
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Project mention: Hyperflask – Full stack Flask and Htmx framework | news.ycombinator.com | 2025-10-16
A lot of people in this thread mentioning the limitations of Flask and “why not FastAPI” etc - but I’ve found Litestar to be the best alternative and it has htmx support out of the box.
https://litestar.dev/
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Integuru
The first AI agent that builds permissionless integrations through reverse engineering platforms' internal APIs.
Project mention: Show HN: Integuru – Integrate with platforms via the source code | news.ycombinator.com | 2026-05-29 -
connexion
Connexion is a modern Python web framework that makes spec-first and api-first development easy.
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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datamodel-code-generator
Generate Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON/YAML/CSV.
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Project mention: N8n added native persistent storage with DataTables | news.ycombinator.com | 2025-10-02
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If any of those bugs were in public or open-source APIs, I’d love to feature them in our new “trophy case”: https://github.com/schemathesis/schemathesis/issues/new?temp...
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uvicorn-gunicorn-fastapi-docker
Docker image with Uvicorn managed by Gunicorn for high-performance FastAPI web applications in Python with performance auto-tuning.
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Project mention: fastapi-crudrouter is Dead. Here's How to Migrate to BetterCRUD | dev.to | 2026-08-09
fastapi-crudrouter was the de-facto CRUD library for FastAPI — generating 6 CRUD routes from a model in a few lines. It's been unmaintained since November 2023. No FastAPI 0.141+ support, no new features, and its SQLAlchemy backend doesn't keep up with SQLAlchemy 2.0 async best practices.
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agent-protocol
Common interface for interacting with AI agents. The protocol is tech stack agnostic - you can use it with any framework for building agents.
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apispec
A pluggable API specification generator. Currently supports the OpenAPI Specification (f.k.a. the Swagger specification)..
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Project mention: ctxure alternatives - mashumaro, cattrs, pydantic, and msgspec | libhunt.com/r/ctxure | 2026-06-05
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Python OpenAPI discussion
Python OpenAPI related posts
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Outsourcing plus LocalAI will soon become more economical vs. Frontier labs
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Computer Use Is 45x More Expensive Than Structured APIs
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Show HN: CLI to order groceries via reverse-engineered REWE API (Haskell)
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Notes on Starting to Use Django
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Karpathy: A few random notes from Claude coding quite a bit last few weeks
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An open-source, HIPAA-eligible Twilio alternative
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Node.js vs Python: Real Benchmarks, Performance Insights, and Scalability Analysis
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A note from our sponsor - AppSignal
www.appsignal.com | 6 Sep 2026
Index
What are some of the best open-source OpenAPI projects in Python? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | open-webui | 150,745 |
| 2 | fastapi | 102,067 |
| 3 | fastapi_mcp | 12,000 |
| 4 | django-ninja | 9,180 |
| 5 | litestar | 8,444 |
| 6 | Integuru | 4,763 |
| 7 | connexion | 4,612 |
| 8 | mcpo | 4,363 |
| 9 | datamodel-code-generator | 4,007 |
| 10 | tracecat | 3,787 |
| 11 | flasgger | 3,741 |
| 12 | Schemathesis | 3,581 |
| 13 | drf-yasg | 3,545 |
| 14 | uvicorn-gunicorn-fastapi-docker | 2,916 |
| 15 | best-of-web-python | 2,756 |
| 16 | openapi-python-client | 1,984 |
| 17 | fastapi-crudrouter | 1,693 |
| 18 | agent-protocol | 1,463 |
| 19 | apispec | 1,219 |
| 20 | apiflask | 1,136 |
| 21 | mashumaro | 935 |
| 22 | flask-smorest | 719 |
| 23 | ghapi | 685 |
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