Best Open Source Developer Tools Tools in 2026

OpenFlowKit

Design & Creative Developer Tools AI & Machine Learning

Local-first AI diagramming tool for developers and builders

stars 464license MITlang TypeScript

Diagramming Local-first Developer Tools+3

Cline

AI & Machine Learning Developer Tools LLMOps & AI Tooling

VS Code AI agent that plans and edits across your entire project

stars 61.7Klicense Apache-2.0lang TypeScript

AI Coding Assistant AI Agents Developer Tools+3

OpenBug

Product & Project Management Developer Tools Communication & Collaboration

Open source collaborative workspace for debugging issues

stars 22license MITlang TypeScript

Project Management Workflow Automation Error Tracking+3

Arcmark

Business & Productivity Developer Tools

Native macOS bookmark manager with browser integration

stars 467license MITlang Swift

macOS Link Management & Shorteners Browser Extension+2

Surfpool

Developer Tools Web Development DevOps & CI/CD

Drop-in local Solana test validator with forking support

stars 549license Apache-2.0lang Rust

Testing Developer Tools Web3+3

OpenClix

Marketing & Growth APIs & Integration Developer Tools

Open source mobile retention and engagement automation

stars 38license MITlang TypeScript

Workflow Automation Developer Tools AI Agents+4

Octrafic

AI & Machine Learning Developer Tools DevOps & CI/CD

AI-powered CLI for automated API testing with natural language

stars 33license MITlang Go

AI Coding Assistant API Development Tools CLI+4

Billing SDK

Finance & Fintech Web Development Developer Tools

Open source React components for SaaS billing flows

stars 453license GPL-3.0lang TypeScript

Developer Tools UI/UX Design Invoicing & Payments+4

Puck

Web Development No-Code & Low-Code Developer Tools

Open source drag-and-drop page editor for any React app

stars 12.7Klicense MITlang TypeScript

No Code Low-code Website Builder+4

ChartDB

Databases & Storage Developer Tools Data & Analytics

Free open source database diagram editor and visualizer

stars 22.2Klicense AGPL-3.0lang TypeScript

Database Data Visualization Developer Tools+2

GPT-Burger

AI & Machine Learning Business & Productivity Developer Tools

Tag, sort, and organize ChatGPT conversations in Chrome

stars 9lang JavaScript

Browser Extension Knowledge Management Note-taking Apps+3

bitchat

Communication & Collaboration Security & Monitoring Developer Tools

Peer-to-peer encrypted chat over Bluetooth mesh network

stars 25.8Klicense Unlicenselang Swift

Chat Security Self Hosted+3

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OpenFlowKit

Cline

OpenBug

Arcmark

Surfpool

OpenClix

Octrafic

Billing SDK

Puck

ChartDB

GPT-Burger

bitchat

OpenFlowKit

Cline

OpenBug

Arcmark

Surfpool

OpenClix

Octrafic

Billing SDK

Puck

ChartDB

GPT-Burger

bitchat