Top 47 Alternative OpenSource for API in 2025

n8n
Free and source-available fair-code licensed workflow automation tool. Easily automate tasks across different services.

n8n

Development & IT

Free and source-available fair-code licensed workflow automation tool. Easily automate tasks across different services.

763.4K
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Strapi
Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable and developer-first.

Strapi

Development & IT

Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable and developer-first.

676.0K
visit
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keycloak
Open Source Identity and Access Management For Modern Applications and Services

keycloak

Customer onboarding

Open Source Identity and Access Management For Modern Applications and Services

540.5K
visit
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node-red
Low-code programming for event-driven applications

node-red

Development & IT

Low-code programming for event-driven applications

529.2K
visit
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pipedream
Connect APIs, remarkably fast. Free for developers.

pipedream

Development & IT

Connect APIs, remarkably fast. Free for developers.

435.3K
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Appsmith
Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.

Appsmith

Development & IT

Platform to build admin panels, internal tools, and dashboards. Integrates with 25+ databases and any API.

314.7K
visit
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hoppscotch
Open source API development ecosystem - https - //hoppscotch.io (open-source alternative to Postman, Insomnia)

hoppscotch

Development & IT

Open source API development ecosystem - https - //hoppscotch.io (open-source alternative to Postman, Insomnia)

197.4K
visit
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directus
The Modern Data Stack 🐰 — Directus is an instant REST+GraphQL API and intuitive no-code data collaboration app for any SQL database.

directus

Development & IT

The Modern Data Stack 🐰 — Directus is an instant REST+GraphQL API and intuitive no-code data collaboration app for any SQL database.

193.6K
visit
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PeerTube
ActivityPub-federated video streaming platform using P2P directly in your web browser

PeerTube

Video

ActivityPub-federated video streaming platform using P2P directly in your web browser

151.7K
visit
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baserow
Baserow is an open source no-code database tool and Airtable alternative.

baserow

Development & IT

Baserow is an open source no-code database tool and Airtable alternative.

145.3K
visit
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hydra
OpenID Certified™ OpenID Connect and OAuth Provider written in Go - cloud native, security-first, open source API security for your infrastructure.

hydra

Security

OpenID Certified™ OpenID Connect and OAuth Provider written in Go - cloud native, security-first, open source API security for your infrastructure.

108.4K
visit
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NocoDB
Open Source Alternative to Airtable

NocoDB

Development tools

Open Source Alternative to Airtable

99.4K
visit
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Free
reflex
🕸️ Web apps in pure Python 🐍

reflex

Web builders

🕸️ Web apps in pure Python 🐍

88.6K
visit
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wasp
The fastest way to develop full-stack web apps with React & Node.js.

wasp

Development & IT

The fastest way to develop full-stack web apps with React & Node.js.

55.0K
visit
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nhost
The Open Source Firebase Alternative with GraphQL.

nhost

Development & IT

The Open Source Firebase Alternative with GraphQL.

24.4K
visit
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instant
The realtime client-side database

instant

Development & IT

The realtime client-side database

1.6K
visit
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fonoster
🚀 The open-source alternative to Twilio.

fonoster

Customer experience

🚀 The open-source alternative to Twilio.

386
visit
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Remotely Remote
A remote control and remote scripting solution, built with .NET 8, Blazor, and SignalR.

Remotely Remote

Development & IT

A remote control and remote scripting solution, built with .NET 8, Blazor, and SignalR.

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ToolJet
Low-code platform for building business applications. Connect to databases, cloud storages, GraphQL, API etc and build apps using drag and drop application builder.

ToolJet

Build it yourself

Low-code platform for building business applications. Connect to databases, cloud storages, GraphQL, API etc and build apps using drag and drop application builder.

stars
bagisto
Free and open source laravel eCommerce platform

bagisto

Ecommerce

Free and open source laravel eCommerce platform

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budibase
Low code platform for building business apps and workflows in minutes. Supports PostgreSQL, MySQL, MSSQL, MongoDB, Rest API, Docker, K8s, and more 🚀

budibase

Build it yourself

Low code platform for building business apps and workflows in minutes. Supports PostgreSQL, MySQL, MSSQL, MongoDB, Rest API, Docker, K8s, and more 🚀

stars
encore
Encore is the Backend Development Platform for building distributed systems and event-driven applications.

encore

Development & IT

Encore is the Backend Development Platform for building distributed systems and event-driven applications.

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Illa Builder
Low-code platform allows you to build business apps, enables you to quickly

Illa Builder

Build it yourself

Low-code platform allows you to build business apps, enables you to quickly

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insomnia
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

insomnia

Cloud services & hosting

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

stars
opnform
Beautiful Open-Source Form Builder

opnform

Form builders

Beautiful Open-Source Form Builder

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insomnia
The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

insomnia

Development & IT

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

stars
manticoresearch
Easy to use open source fast database for search | Good alternative to Elasticsearch now | Drop-in replacement for E in the ELK soon

manticoresearch

Development & IT

Easy to use open source fast database for search | Good alternative to Elasticsearch now | Drop-in replacement for E in the ELK soon

stars
medusa
Building blocks for digital commerce

medusa

Ecommerce

Building blocks for digital commerce

stars
meilisearch
A lightning-fast search API that fits effortlessly into your apps, websites, and workflow

meilisearch

Development & IT

A lightning-fast search API that fits effortlessly into your apps, websites, and workflow

stars
filestash
🦄 A file manager / web client for SFTP, S3, FTP, WebDAV, Git, Minio, LDAP, CalDAV, CardDAV, Mysql, Backblaze, ...

filestash

Cloud services & hosting

🦄 A file manager / web client for SFTP, S3, FTP, WebDAV, Git, Minio, LDAP, CalDAV, CardDAV, Mysql, Backblaze, ...

stars
minio
The Object Store for AI Data Infrastructure

minio

Cloud services & hosting

The Object Store for AI Data Infrastructure

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labrinth
Our Rust-based backend utilizing the actix-web framework to serve Modrinth's API.

labrinth

Development & IT

Our Rust-based backend utilizing the actix-web framework to serve Modrinth's API.

stars
navidrome
Modern Music Server and Streamer compatible with Subsonic/Airsonic

navidrome

Audio

Modern Music Server and Streamer compatible with Subsonic/Airsonic

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OpenSearch
🔎 Open source distributed and RESTful search engine.

OpenSearch

Development & IT

🔎 Open source distributed and RESTful search engine.

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engine
The Orchestration Engine To Deliver Self-Service Infrastructure ⚡️

engine

Cloud services & hosting

The Orchestration Engine To Deliver Self-Service Infrastructure ⚡️

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reaction
Mailchimp Open Commerce is an API-first, headless commerce platform built using Node.js, React, GraphQL. Deployed via Docker and Kubernetes.

reaction

Ecommerce

Mailchimp Open Commerce is an API-first, headless commerce platform built using Node.js, React, GraphQL. Deployed via Docker and Kubernetes.

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saleor
Saleor Core -  the high performance, composable, headless commerce API.

saleor

Ecommerce

Saleor Core - the high performance, composable, headless commerce API.

stars
shlink
The definitive self-hosted URL shortener

shlink

Cloud services & hosting

The definitive self-hosted URL shortener

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spree
An open source eCommerce platform giving you full control and customizability. Modular and API-first. Build any eCommerce solution that your business requires. Developed by @vendo-dev

spree

Ecommerce

An open source eCommerce platform giving you full control and customizability. Modular and API-first. Build any eCommerce solution that your business requires. Developed by @vendo-dev

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dub
Open-source link management infrastructure. Loved by modern marketing teams like Vercel, Raycast, and Perplexity.

dub

Marketing management

Open-source link management infrastructure. Loved by modern marketing teams like Vercel, Raycast, and Perplexity.

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