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Open Source Alternatives

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API Development Open Source Tools - Page 2

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API Development Open Source Tools

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53 projects, sorted by GitHub stars.

Xray-core

Alternative toAstrill VPN

Open source proxy core with XTLS, VLESS, and REALITY protocols

42,209 GitHub stars
Licence MPL-2.0

Appsmith

Alternative toRetool

Build internal tools with a low-code drag-and-drop UI

41,095 GitHub stars
Licence Apache-2.0

Novu

Alternative toCourier

Open source notification infrastructure for product teams

40,175 GitHub stars
Licence MIT

Directus

Alternative toContentful

Wrap any SQL database with REST and GraphQL APIs and an admin UI

38,631 GitHub stars

Better Auth

Alternative toClerk

Drop-in TypeScript auth with MFA, SSO, and multi-tenancy support

30,392 GitHub stars
Licence MIT

nautilus_trader

Alternative toQuantConnect

Rust-native trading engine with research-to-live parity

30,380 GitHub stars
Licence LGPL-3.0

Bagisto

Alternative toShopify

Laravel eCommerce with headless API and no transaction fees

28,259 GitHub stars
Licence MIT

Typesense

Alternative toAlgolia

Fast typo-tolerant search engine with instant results

27,014 GitHub stars
Licence GPL-3.0

Saleor

Alternative tocommercetools

Open source headless e-commerce platform with GraphQL API

23,459 GitHub stars
Licence BSD-3-Clause

Yaak

Alternative toPostman

Local-first API client for HTTP, GraphQL, and WebSocket

19,338 GitHub stars
Licence MIT

Keploy

Alternative toPostman

AI-powered tool that converts API traffic into test cases

18,658 GitHub stars
Licence Apache-2.0
#Testing

PouchDB

Alternative toGoogle Cloud Firestore

JavaScript database that syncs with CouchDB, works offline

17,623 GitHub stars
Licence Apache-2.0
#Database