API Development Open Source Tools

Alternative toApryse PDF SDK

Fast open source library for rendering and editing PDFs

• 3,007 GitHub stars
• AGPL-3.0Licence AGPL-3.0

Alternative toHHuman API

Open source health API for wearable device developers

• 2,692 GitHub stars
• MITLicence MIT

Alternative toApigee

Build, document, and monetize APIs from one self-hosted platform

• 2,127 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative tongrok

Get a public HTTPS URL for your local development server

• 1,885 GitHub stars
• MITLicence MIT

Alternative toFirebase

Self-hosted backend with real-time API and search built in

• 1,668 GitHub stars
• Apache-2.0Licence Apache-2.0
• #BaaS

Alternative toAdobe Acrobat

Open source PDF editor and viewer for Windows and Linux

• 1,503 GitHub stars
• MITLicence MIT

Alternative toContentful

Enterprise-ready open source CMS built on Symfony

• 1,361 GitHub stars
• MITLicence MIT
• #CMS

Alternative toWorkOS FGA

Run fine-grained authorization with RBAC, ABAC, and ReBAC

• 1,335 GitHub stars
• Apache-2.0Licence Apache-2.0

Alternative toStripe Billing

Open source React components for SaaS billing flows

• 508 GitHub stars
• GPL-3.0Licence GPL-3.0

Alternative toFirebase

Full-stack framework for building production-ready web apps

• 432 GitHub stars
• Apache-2.0Licence Apache-2.0