70+ Free Developer Tools & Resources | Curated for 2026

Tool Besuchen developer.chrome.com

Lighthouse

Run automated audits for performance, accessibility, SEO, and best practices directly in Chrome DevTools or CI pipelines.

Tool Besuchen www.webpagetest.org

WebPageTest

Advanced performance testing from 40+ global locations with filmstrip view, video comparison, and Core Web Vitals breakdown.

Tool Besuchen tinypng.com

TinyPNG

Compress PNG and JPEG images by up to 70% without visible quality loss using smart lossy compression algorithms.

Tool Besuchen bundlephobia.com

Bundlephobia

Check the size cost of adding any npm package to your JavaScript bundle before installing it in your project.

Tool Besuchen squoosh.app

Squoosh

Advanced image compression app by Google Chrome Labs supporting WebP, AVIF, and MozJPEG with visual comparison.

Sicherheit Performance Tipp

Cloudflare

Protect and accelerate your website with CDN, DDoS protection, Web Application Firewall, DNS management, and zero-trust security.

Tool Besuchen www.cloudflare.com

Sicherheit Tipp

SSL Labs

Deep analysis of your SSL/TLS server configuration with detailed grading, certificate chain validation, and protocol testing.

Tool Besuchen www.ssllabs.com

Tool Besuchen securityheaders.com

Security Headers

Scan your website's HTTP security headers and get an instant grade with actionable recommendations for each missing header.

Tool Besuchen observatory.mozilla.org

Mozilla Observatory

Comprehensive security assessment covering HTTP headers, TLS configuration, cookies, and third-party content best practices.

Tool Besuchen haveibeenpwned.com

Have I Been Pwned

Check if your email or phone number has been compromised in any data breach across 700+ breached sites and 14B+ accounts.

Tool Besuchen www.zaproxy.org

OWASP ZAP

Open-source web application security scanner for finding vulnerabilities like XSS, SQL injection, and CSRF during development.

Tool Besuchen csp-evaluator.withgoogle.com

CSP Evaluator

Evaluate and validate your Content Security Policy for weaknesses, bypasses, and misconfigurations using Google's analysis engine.

Sicherheit Lernen

Web Security Academy

Learn real-world web security with free interactive labs covering OWASP Top 10, API security, and advanced topics from PortSwigger.

Tool Besuchen portswigger.net

Entwicklung Tipp

Visual Studio Code

Free, extensible code editor with IntelliSense, integrated debugging, Git support, and 40,000+ extensions for every language.

Tool Besuchen code.visualstudio.com

Entwicklung KI & ML Tipp

Cursor

AI-first code editor built on VS Code with native AI integration for intelligent code generation, editing, and codebase understanding.

Tool Besuchen www.cursor.com

Entwicklung Tipp

GitHub

The world's largest code hosting platform with version control, CI/CD, project management, Copilot AI, and 100M+ developers.

Tool Besuchen github.com

Tool Besuchen www.postman.com

Postman

Design, test, and document APIs with a collaborative platform supporting REST, GraphQL, WebSocket, and gRPC protocols.

Tool Besuchen hoppscotch.io

Hoppscotch

Open-source, lightweight API testing tool for REST, GraphQL, and WebSocket APIs directly in your browser with zero setup.

Tool Besuchen regex101.com

Regex101

Build, test, and debug regular expressions with real-time explanations, match highlighting, and a library of community patterns.

Tool Besuchen carbon.now.sh

Carbon

Create beautiful screenshots of your code for sharing on social media, documentation, slides, or blog posts with custom themes.

DevDocs

Fast, offline-capable API documentation browser combining 600+ docs in a clean, searchable interface with instant results.

Tool Besuchen devdocs.io

Tool Besuchen jsoncrack.com

JSON Crack

Visualize JSON, YAML, and CSV data as interactive graphs to understand complex nested structures and relationships at a glance.

KI & ML Tipp

Hugging Face

The hub for machine learning with 500K+ pre-trained models, datasets, and Spaces for building and deploying AI applications.

Tool Besuchen huggingface.co

KI & ML Tipp

ChatGPT

OpenAI's conversational AI for coding assistance, content generation, data analysis, and creative problem-solving with GPT-4.

Tool Besuchen chat.openai.com

KI & ML Tipp

Claude

Anthropic's AI assistant excelling at analysis, coding, math, and long-context conversations with industry-leading safety standards.

Tool Besuchen claude.ai

Tool Besuchen colab.research.google.com

Google Colab

Free Jupyter notebook environment with GPU and TPU access for machine learning experiments, data analysis, and education.

Tool Besuchen www.kaggle.com

Kaggle

Machine learning competition platform with 200K+ free datasets, GPU-powered notebooks, courses, and a vibrant data science community.

Ollama

Run large language models locally on your machine with a simple CLI — supports Llama 3, Mistral, Gemma, CodeLlama, and 100+ models.

Tool Besuchen ollama.com

Tool Besuchen replicate.com

Replicate

Run and deploy open-source ML models in the cloud with simple API calls, auto-scaling, and pay-per-second pricing.

Tool Besuchen www.gradio.app

Gradio

Build and share machine learning demos and web applications with a few lines of Python — deploy to Hugging Face Spaces instantly.

Tool Besuchen lmstudio.ai

LM Studio

Desktop app to discover, download, and run local LLMs with a chat interface and an OpenAI-compatible local API server.

KI & ML Entwicklung

v0 by Vercel

AI-powered UI generation tool that creates production-ready React components from text descriptions using shadcn/ui and Tailwind.

Tool Besuchen v0.dev

Monitoring Tipp

UptimeRobot

Monitor website uptime every 5 minutes with 50 free monitors and instant alerts via email, SMS, Slack, or webhooks.

Tool Besuchen uptimerobot.com

Monitoring Tipp

Google Analytics

Industry-standard web analytics for tracking traffic sources, user behavior, conversions, and audience demographics at any scale.

Tool Besuchen analytics.google.com

Sentry

Application monitoring and error tracking for frontend, backend, and mobile with detailed stack traces, breadcrumbs, and session replay.

Tool Besuchen sentry.io

Tool Besuchen plausible.io

Plausible Analytics

Lightweight, privacy-friendly web analytics that is GDPR/CCPA compliant, cookie-free, and under 1KB in script size.

Tool Besuchen betterstack.com

Better Stack

Beautiful uptime monitoring, incident management, and log aggregation in a developer-friendly platform with Slack and PagerDuty integrations.

Tool Besuchen www.checklyhq.com

Checkly

Monitor API endpoints and browser interactions with programmable synthetic checks using Playwright and Node.js from 20+ global locations.

Design & UI Tipp

Figma

Collaborative interface design tool for UI/UX with prototyping, design systems, Dev Mode, and real-time multiplayer editing.

Tool Besuchen www.figma.com

Design & UI Entwicklung Tipp

Tailwind CSS

Utility-first CSS framework for rapidly building modern UIs with a rich plugin ecosystem, JIT compiler, and excellent DX.

Tool Besuchen tailwindcss.com

Tool Besuchen heroicons.com

Heroicons

Beautiful hand-crafted SVG icons by the Tailwind CSS team — 300+ icons available as React and Vue components or raw SVGs.

Coolors

Generate perfect color palettes in seconds with contrast checking, palette exploration, color blindness simulation, and export to any format.

Tool Besuchen coolors.co

Tool Besuchen unsplash.com

Unsplash

Access 4M+ free high-resolution photos from 300K+ photographers for commercial and personal use — no attribution required.

Tool Besuchen excalidraw.com

Excalidraw

Virtual whiteboard for sketching diagrams with a hand-drawn aesthetic, real-time collaboration, and easy embedding in docs.

Lucide Icons

Beautiful and consistent open-source icon library with 1,500+ icons available as SVG, React, Vue, Svelte, and more.

Tool Besuchen lucide.dev

Tool Besuchen www.realtimecolors.com

Realtime Colors

Visualize your color palette on a real website mockup instantly — see how your font, background, and accent choices feel in context.

SEO & Marketing Tipp

Google Search Console

Monitor your site's search performance, fix indexing issues, submit sitemaps, and understand how Google discovers your pages.

Tool Besuchen search.google.com

SEO & Marketing Tipp

Ahrefs Webmaster Tools

Free site audit scanning 100+ SEO issues, backlink profile analysis, and organic keyword tracking for website owners.

Tool Besuchen ahrefs.com

Tool Besuchen www.screamingfrog.co.uk

Screaming Frog SEO Spider

Desktop SEO crawler for auditing technical SEO — find broken links, analyze metadata, audit redirects, and generate XML sitemaps.

Tool Besuchen validator.schema.org

Schema Markup Validator

Test and validate your structured data markup to ensure rich result eligibility and correct implementation in Google Search.

Tool Besuchen answerthepublic.com

AnswerThePublic

Discover what questions real people ask about any topic — fuel your content strategy with search-driven keyword and question research.

Tool Besuchen trends.google.com

Google Trends

Explore trending search queries, compare keyword popularity over time, and discover seasonal patterns across regions and categories.

Tool Besuchen neilpatel.com

Ubersuggest

Keyword research tool with search volume, SEO difficulty scores, content ideas, backlink data, and competitor domain analysis.

DevOps & Cloud Tipp

Docker

Build, ship, and run applications in containers for consistent development, testing, and production environments everywhere.

Tool Besuchen www.docker.com

DevOps & Cloud Tipp

Vercel

Deploy frontend applications with zero configuration, edge functions, automatic HTTPS, preview deployments, and global CDN.

Tool Besuchen vercel.com

GitHub Actions

Automate CI/CD workflows, testing, linting, and deployment directly from your GitHub repository with 15,000+ community actions.

Tool Besuchen github.com

Tool Besuchen www.digitalocean.com

DigitalOcean

Simple, affordable cloud infrastructure with droplets, managed databases, Kubernetes, serverless functions, and app platform.

Coolify

Self-hostable, open-source alternative to Heroku and Netlify with Docker-based deployments, databases, and SSL on your own server.

Tool Besuchen coolify.io

Tool Besuchen railway.app

Railway

Deploy applications, databases, and services instantly with automatic builds from Git, horizontal scaling, and a generous free tier.

Tool Besuchen forge.laravel.com

Laravel Forge

Provision and manage optimized PHP servers on AWS, DigitalOcean, or any VPS with automated deployments, SSL, and queue workers.

Produktivität Tipp

Notion

All-in-one workspace combining notes, docs, wikis, project boards, databases, and AI writing in a flexible, block-based interface.

Tool Besuchen www.notion.so

Produktivität Tipp

Linear

Streamlined issue tracking and project management for high-performance teams with keyboard-first design and GitHub integration.

Tool Besuchen linear.app

Tool Besuchen www.raycast.com

Raycast

Blazingly fast Mac launcher replacing Spotlight with extensions for GitHub, Jira, Figma, clipboard history, and custom scripts.

Tool Besuchen obsidian.md

Obsidian

Private knowledge base using local Markdown files with bidirectional linking, graph visualization, and 1,000+ community plugins.

Cal.com

Open-source scheduling platform for booking meetings with calendar sync, custom availability rules, team scheduling, and API access.

Tool Besuchen cal.com

Tool Besuchen www.warp.dev

Warp

Modern terminal reimagined with AI command search, collaborative workflows, IDE-like editing, and intelligent auto-completions.

Tool Besuchen www.loom.com

Loom

Record and share quick video messages for async communication with automatic transcription, viewer insights, and team libraries.

Lernen Tipp

Laracasts

Premier video tutorial platform for Laravel, PHP, Vue.js, and modern web development with expert instruction and hands-on exercises.

Tool Besuchen laracasts.com

Lernen Tipp

freeCodeCamp

Free, interactive coding curriculum with 12 certifications covering web development, data science, machine learning, and more.

Tool Besuchen www.freecodecamp.org

Dev.to

Inclusive developer community for sharing articles, tutorials, and discussions about programming, career growth, and technology.

Tool Besuchen dev.to

Tool Besuchen laravel-news.com

Laravel News

Official community portal for Laravel ecosystem news, package releases, tutorials, job listings, and conference updates.

Tool Besuchen stackoverflow.com

Stack Overflow

The world's largest Q&A community for programmers with 24M+ questions and answers spanning every technology and framework.