Best Developer Tools Open Source Tools in 2026

Hume AI

AI & Machine Learning Communication & Collaboration Data & Analytics

Empathic voice AI SDK with open source emotional models

stars 80license MITlang TypeScript

LLM Chatbots Customer Support+3

OpenClix

Marketing & Growth AI & Machine Learning Web & App Development

Open source mobile retention and engagement automation

stars 37license MITlang TypeScript

AI Agents Developer Tools

Octrafic

AI & Machine Learning Web & App Development Product & Project Management

AI-powered CLI for automated API testing with natural language

stars 32license MITlang Go

Developer Tools API Development Tools Testing+2

Nexion

IT Management Web & App Development Security & Monitoring

Web3 SSH manager that replaces passwords with crypto keys

stars 16license NOASSERTIONlang TypeScript

Web3 Server Management Authentication+5

Billing SDK

Web & App Development Finance & Fintech

Open source React components for SaaS billing flows

stars 446license GPL-3.0lang TypeScript

Developer Tools UI/UX Design

Disco.dev

AI & Machine Learning Web & App Development Business & Productivity+1

Simplify AI agent integrations with open-source MCP servers

stars 74lang TypeScript

Open Core Developer Tools Workflow Automation+5

ChartDB

Web & App Development Data & Analytics Product & Project Management+1

Free open source database diagram editor and visualizer

stars 22.1Klicense AGPL-3.0lang TypeScript

Database Data Visualization Developer Tools+9

GPT-Burger

Business & Productivity AI & Machine Learning Web & App Development

Tag, sort, and organize ChatGPT conversations in Chrome

stars 9lang JavaScript

Browser Extension AI Coding Assistant Knowledge Management+5

Twenty

Business & Productivity Communication & Collaboration Customer Support

Self-hosted open source CRM with a customizable data model

stars 45.2Klicense NOASSERTIONlang TypeScript

CRM Open Core Self Hosted+6

Jan

AI & Machine Learning Business & Productivity Web & App Development

Run open source LLMs on your own hardware with no cloud required

stars 42.2Klicense NOASSERTIONlang TypeScript

LLM Developer Tools AI Coding Assistant+4

Ghost

Web & App Development Marketing & Growth Business & Productivity

Launch a newsletter or paid membership site on your own server

stars 52.7Klicense MITlang JavaScript

Headless CMS Blogging Website Builder+12

N8N2MCP

AI & Machine Learning Web & App Development Business & Productivity+2

Bridge n8n automations into MCP tools for Claude and Cursor

stars 130license MITlang HTML

Workflow Automation API Infrastructure Developer Tools+10

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Hume AI

OpenClix

Octrafic

Nexion

Billing SDK

Disco.dev

ChartDB

GPT-Burger

Twenty

Jan

Ghost

N8N2MCP

Hume AI

OpenClix

Octrafic

Nexion

Billing SDK

Disco.dev