Open Source APIs

Popular first highlights editorial picks, then ranks providers by monthly downloads of their official SDKs on npm and PyPI (measured 2026-10-18). Others follow A–Z.

Meltano

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Metabase

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metriql Docs

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Microcks

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MindsDB

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MLflow

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Mock Service Worker

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NATS.io

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Netlify CMS

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Newman

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NextAuth.js

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NLP.js

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NocoDB

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Nuxt.js

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Ollama

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Open Accounting

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Open Collective

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Open Policy Agent

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OpenAPI Initiative

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OpenAPI-to-GraphQL

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OpenBB 🦋

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OpenJS Foundation

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Opensource user analytics and engagement platform

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Opensource.builders

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OpenStack

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OpenVAS

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OpenWrt

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Optic

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orval

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OWASP

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Pact

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Parcel

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passbolt

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Payload CMS

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Phabricator

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PingCAP

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Plance

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Playwright

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PocketBase

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Polly.JS

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Ponzu CMS

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Portman

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Postgraphile

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Prism

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Project Naptha

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Prompts.ai

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Purplship

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PyTorch

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Counts reflect unique named profiles assigned to this category. Documentation and integration details vary by provider.