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.

QuarkusIO

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QuestDB

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Quill

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RapiDoc

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Rasa

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ReactiveX

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Red Hat

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ReDoc

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Redoc.ly

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RedwoodJS

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Remix

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Restack

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Robo

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Rocket.Chat

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RxJS

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Saleor

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Sandpack

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Sandworm

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SapphireDb

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scikit-learn

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Scully

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Session

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Signal Messenger

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SimpleX chat

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Slicknode

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Spectral

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Spring

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SQLite

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Stability AI

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StackEdit

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StarCoder

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Swagger

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Swagger UI

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Tabnine

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TastyIgniter

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TensorFlow

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ToolJet

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Unbiasify

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Uppy

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UXBOXTool

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WebAssembly

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WebKit

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wink

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xoops.org

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Yugabyte

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Zen Cart

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Zipline

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ZITADEL

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