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.

CakePHP

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Calendso

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Canonical

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Cedille

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Chatwoot

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Chocolatey

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Chromium

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Cirrus Labs

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ClickHouse

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Cloud Events

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Cloud Foundry

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CNCF

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Composer

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Conjur

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Convoy

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Cookie Consent by Osano

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CouchDB

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CraftCMS

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CRI-O

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Cusdis

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Cypress.io

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DapperDox

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Dapr

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Databricks

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Debezium Project

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DeltaLakeOSS

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Deno

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Django

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Django REST framework

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Dredd

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EC

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EdgeDB

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Editor.js

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Elasticsearch

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Electron

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Element Finance

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Encore

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Envoy

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Evergreen

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falcosecurity

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Flowise

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Fluent Bit

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Fluentd

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Focalboard

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Formance

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Fosscord

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Foundation

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freeradius

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