Free
OpenTelemetry
Open SourceAPM & Tracing · Monitoring & Observability
Vendor-neutral standard for traces, metrics and logs instrumentation.
tracingtelemetryobservabilitystandard
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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.
Reference & Standards · Security
Open-source web app security scanner for finding vulnerabilities in your own apps.
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.
Design Tools · Design & Prototyping
Open-source design and prototyping platform, SVG-native.
Stock & Placeholders · Image & Media
Free stock photos and videos with an API.
GUI Clients · Database
The most popular open-source administration GUI for PostgreSQL.
Relational · Database
Open-source vector similarity search extension for PostgreSQL.
Frameworks · Backend
Productive Elixir web framework with realtime channels.
Programming Languages
Official PHP website with language documentation and downloads.
Ecosystem · CSS Tools
Minimal classless CSS framework — semantic HTML instantly looks clean and responsive.
Development Platforms · IoT & Embedded
Professional embedded development platform — 1,000+ boards, library manager and debugging inside VS Code.
Web Analytics · Monitoring & Observability
Lightweight, privacy-friendly open-source web analytics.
Package Managers · Development Environment
Fast, disk-efficient JavaScript package manager with strict dependencies.
Serverless & BaaS · Database
Open-source backend in one file: SQLite database, auth, realtime and files.
Containers · DevOps
Daemonless, rootless container engine, Docker-compatible CLI.
Payments · API Tools
Open-source payments and monetization for developers — checkouts, subscriptions and license keys, MoR model.
Notebooks & Data Science · Data & Analytics
Blazing-fast Rust-based dataframe library for Python and Rust.
Stock & Placeholders · Image & Media
Thousands of free low-poly 3D models (CC0/CC-BY) with a searchable gallery and a Google-Drive-like library.