Best Open Source Developer Tools Tools in 2026

Apache Superset

Data & Analytics Business & Productivity Developer Tools

Open source data visualization and BI exploration tool

stars 72.6Klicense Apache-2.0lang TypeScript

Data Visualization Web Analytics Self Hosted+4

Flameshot

Design & Creative Business & Productivity Developer Tools

Open source screenshot tool with annotation and upload

stars 29.8Klicense GPL-3.0lang C++

Graphic Design Developer Tools Documentation+1

Syncthing

IT Management Developer Tools Communication & Collaboration

Decentralized continuous file sync with no central server

stars 83.4Klicense MPL-2.0lang Go

File Sync & Storage Self Hosted Privacy Tools+2

Cal

Business & Productivity Communication & Collaboration Developer Tools

Self-hosted Calendly alternative with unlimited scheduling types

stars 42.2Klicense MITlang TypeScript

Calendars & Scheduling Open Core API Infrastructure+3

ContextPool

AI & Machine Learning Developer Tools Databases & Storage

Persistent memory solution for AI agents across sessions

stars 10lang PowerShell

AI Agents Developer Tools Database+3

showmd

Developer Tools Business & Productivity Product & Project Management

The most readable way to preview any .md file on macOS.

stars 24lang Swift

macOS Developer Tools Documentation+4

Ollama

AI & Machine Learning LLMOps & AI Tooling Developer Tools

Run large language models locally on Mac, Linux, or Windows

stars 170.1Klicense MITlang Go

LLM CLI API Infrastructure+3

Remodex

AI & Machine Learning Developer Tools APIs & Integration

Control Codex agents from your iPhone, open source and free

stars 2.6Klicense Apache-2.0lang Swift

AI Coding Assistant Developer Tools API Client+3

Claudoscope

AI & Machine Learning Developer Tools

Free macOS app for browsing and managing Claude Code sessions

stars 164license MITlang Swift

macOS AI Coding Assistant Monitoring+3

Donut Browser

Security & Monitoring Marketing & Growth Developer Tools

Anti-detect browser with isolated profiles and zero telemetry

stars 2Klicense AGPL-3.0lang Rust

Web Browsers Privacy Tools Security+4

Handle

Design & Creative AI & Machine Learning Developer Tools

Edit UI visually in the browser and sync changes to code

stars 31license MITlang TypeScript

UI/UX Design Browser Extension AI Coding Assistant+3

QoreDB

Databases & Storage Developer Tools

Rust-powered database client for 9 SQL and NoSQL engines

stars 53license Apache-2.0lang TypeScript

Database Developer Tools Local-first+3

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Apache Superset

Flameshot

Syncthing

Cal

ContextPool

showmd

Ollama

Remodex

Claudoscope

Donut Browser

Handle

QoreDB

Apache Superset

Flameshot

Syncthing

Cal

ContextPool

showmd

Ollama

Remodex

Claudoscope

Donut Browser

Handle

QoreDB