Best Developer Tools Open Source Tools in 2026

Optimo

Web & App Development Marketing & Growth Design & Creative

Optimize and convert images and videos using open formats

stars 167license MITlang JavaScript

Developer Tools CLI

VoidZero

Web & App Development

Next-generation unified JavaScript tooling infrastructure

stars 4.4Klicense MITlang Rust

Developer Tools Testing Developer Framework

Screenpipe

AI & Machine Learning Business & Productivity

Record your screen and audio 24/7 for local AI automation

stars 18.4Klicense NOASSERTIONlang Rust

Workflow Automation Knowledge Management Personal Assistant+4

Echolon

Web & App Development IT Management Business & Productivity

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

stars 48license MITlang TypeScript

Developer Tools API Client Git+1

Skills Manager

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

Universal skills manager for Claude Code and AI coding agents

stars 54license MITlang TypeScript

Developer Tools AI Agents AI Coding Assistant

Ycode

Web & App Development Business & Productivity Design & Creative

Open source visual website builder with no-code CMS

stars 125license MITlang TypeScript

Website Builder CMS No Code+2

OpenResource

AI & Machine Learning Web & App Development

Discover and explore open source projects across domains

stars 21.8Klicense NOASSERTIONlang TypeScript

Developer Tools AI Search Tools Self Hosted+1

OpenObserve

Data & Analytics Security & Monitoring IT Management

Self-hosted observability for logs, metrics, and traces

stars 18.6Klicense AGPL-3.0lang TypeScript

Monitoring Self Hosted Developer Tools+3

Unsloth

AI & Machine Learning Web & App Development Data & Analytics

Train LLMs locally without code using a browser-based interface

stars 63.1Klicense Apache-2.0lang Python

LLM Developer Tools LLMOps

mTarsier

AI & Machine Learning Business & Productivity Web & App Development

Free desktop app for managing MCP servers and AI agents

stars 33license MITlang TypeScript

AI Agents Developer Tools Workflow Automation+2

OpenFlags

Product & Project Management Web & App Development IT Management

Self-hosted feature flags for JavaScript with zero dependencies

stars 17license MITlang TypeScript

Feature Flag Self Hosted A/B Testing+3

discli

AI & Machine Learning Communication & Collaboration Web & App Development

CLI for building AI agents and automating Discord servers

stars 19license MITlang Python

AI Agents Chatbots Developer Tools+2

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VoidZero

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Ycode

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Optimo

VoidZero

Screenpipe

Echolon

Skills Manager

Ycode