Free
OpenSearch
Open SourceSearch Engines · Database
Community-driven, open-source fork of Elasticsearch and Kibana.
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Browse the complete directory — use filters to narrow down.
Search Engines · Database
Community-driven, open-source fork of Elasticsearch and Kibana.
APM & Tracing · Monitoring & Observability
Vendor-neutral standard for traces, metrics and logs instrumentation.
Infrastructure as Code · DevOps
Open-source, Linux Foundation successor to Terraform.
Stock & Placeholders · Image & Media
Search engine for openly-licensed media across the web.
Smart Contracts · Web3 & Blockchain
The standard library of audited, secure smart contracts — ERC-20/721/1155 implementations, access control and upgrades.
Relational · Database
Enterprise-grade commercial relational database platform.
Cheatsheets · Documentation & Learning
Collection of developer cheatsheets for many languages and tools.
Documentation Generators · PDF & Documents
The collaborative online LaTeX editor used by academia.
Reference & Standards · Security
Open Worldwide Application Security Project: standards like the Top 10.
Reference & Standards · Security
Open-source web app security scanner for finding vulnerabilities in your own apps.
Accessibility · Testing
Open-source command-line accessibility testing tools.
Payments · API Tools
Merchant-of-record payments for SaaS — global tax, invoicing and subscriptions handled for you.
Uptime & Alerting · Monitoring & Observability
Incident response and on-call management platform.
Load & Performance · Testing
Google's Core Web Vitals and page speed analysis service.
Color Tools
Advanced color scheme designer based on color theory.
Notebooks & Data Science · Data & Analytics
The foundational Python library for dataframes and analysis.
Documentation Generators · PDF & Documents
Universal document converter: Markdown to PDF, DOCX, HTML and more.
UI Libraries · Frontend
Beautifully styled components on top of Ark UI and Panda CSS, copy-paste across React, Vue and Solid.
Headless CMS · Backend
TypeScript-first headless CMS built as a Next.js-native framework.
PDF Tools · PDF & Documents
Large free PDF toolbox, no registration required.
PDF Tools · PDF & Documents
Open-source desktop app to split, merge and rotate PDFs.
Design Tools · Design & Prototyping
Open-source design and prototyping platform, SVG-native.
Visual Regression · Testing
Visual regression testing platform now part of BrowserStack.
Models & LLM APIs · AI for Developers
AI answer engine with live web citations — fast research with sources you can check.