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Open Source Alternatives

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Developer Framework Open Source Tools - Page 4

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52 projects, sorted by GitHub stars.

Ploomber

Alternative toGoogle Cloud Composer

Build reproducible Python data pipelines with DAG orchestration

3,620 GitHub stars
Licence Apache-2.0

Converse.js

Alternative toSlack

Self-hosted web-based XMPP chat client for any server

3,301 GitHub stars
Licence MPL-2.0
#Chat

Apache PDFBox

Alternative toiText 7

Open source Java library for creating and parsing PDFs

3,133 GitHub stars
Licence Apache-2.0

MuPDF

Alternative toApryse PDF SDK

Fast open source library for rendering and editing PDFs

3,007 GitHub stars
Licence AGPL-3.0

Tox

Alternative toThreema Work

Free encrypted P2P messaging and voice calls, no servers

2,696 GitHub stars
Licence GPL-3.0
#Chat

Open Wearables

Alternative toHuman API

Open source health API for wearable device developers

2,692 GitHub stars
Licence MIT

21st.dev

Alternative toTailwind UI

Browse and install production-ready shadcn/ui components via CLI

2,188 GitHub stars
Licence MIT

Untitled UI React

Alternative toTailwind UI

Open source React UI component library with Tailwind CSS

1,971 GitHub stars
Licence MIT

OLMo

Alternative toOpenAI

Allen AI research LLM with public weights and open training code

1,725 GitHub stars
Licence Apache-2.0
#LLM

Sulu

Alternative toContentful

Enterprise-ready open source CMS built on Symfony

1,361 GitHub stars
Licence MIT
#CMS

Steel‑LLM

Alternative toOpenAI

1B Chinese LLM with public weights, training code, and data

814 GitHub stars
#LLM

Billing SDK

Alternative toStripe Billing

Open source React components for SaaS billing flows

508 GitHub stars
Licence GPL-3.0