Free
Openverse
Open SourceStock & Placeholders · Image & Media
Search engine for openly-licensed media across the web.
open-licenseimagesaudiosearch
Browse the complete directory — use filters to narrow down.
Stock & Placeholders · Image & Media
Search engine for openly-licensed media across the web.
Relational · Database
Enterprise-grade commercial relational database platform.
Documentation Generators · PDF & Documents
The collaborative online LaTeX editor used by academia.
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.
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.
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.
Vector Databases · AI for Developers
Managed vector database for AI similarity search at scale.
Serverless & BaaS · Database
Managed MySQL-compatible platform built on Vitess with branching.
Web Analytics · Monitoring & Observability
Lightweight, privacy-friendly open-source web analytics.
Serverless & BaaS · Database
Open-source backend in one file: SQLite database, auth, realtime and files.
Payments · API Tools
Open-source payments and monetization for developers — checkouts, subscriptions and license keys, MoR model.
Stock & Placeholders · Image & Media
Thousands of free low-poly 3D models (CC0/CC-BY) with a searchable gallery and a Google-Drive-like library.
Containers · DevOps
Self-hosted GUI for managing Docker and Kubernetes environments.
Penetration Testing · Security
Free, in-depth web security training with interactive labs, maintained by the Burp Suite team.
Logs & Metrics · Monitoring & Observability
The standard open-source metrics collection and alerting toolkit.
Agent & LLM Frameworks · AI for Developers
The most comprehensive open guide to prompting techniques.
Other Formats · Data Formats
Official Protocol Buffers documentation from Google.
Vector Databases · AI for Developers
Open-source vector database written in Rust, with cloud offering.
Models & LLM APIs · AI for Developers
Alibaba's open-weight model family with multilingual strengths.