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.
Stock & Placeholders · Image & Media
Search engine for openly-licensed media across the web.
Cheatsheets · Documentation & Learning
Collection of developer cheatsheets for many languages and tools.
Reference & Standards · Security
Open Worldwide Application Security Project: standards like the Top 10.
Load & Performance · Testing
Google's Core Web Vitals and page speed analysis service.
Color Tools
Advanced color scheme designer based on color theory.
PDF Tools · PDF & Documents
Large free PDF toolbox, no registration required.
Design Tools · Design & Prototyping
Open-source design and prototyping platform, SVG-native.
Courses & Tutorials · Documentation & Learning
Blog tutorial open-source berbahasa Indonesia — Linux, Python, JavaScript dan dasar pemrograman, gratis selamanya.
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.
Design Tools · Design & Prototyping
Free browser-based Photoshop alternative that opens PSD files.
Stock & Placeholders · Image & Media
Easy-to-use placeholder images from Unsplash via URL parameters.
Stock & Placeholders · Image & Media
Massive library of free images, videos, vectors and audio under the Pixabay license — no attribution required.
Stock & Placeholders · Image & Media
Fast, flexible placeholder image service with a simple URL API.
Web Analytics · Monitoring & Observability
Lightweight, privacy-friendly open-source web analytics.
Ecosystem · CSS Tools
Official Tailwind CSS playground for trying classes in the browser.
Containers · DevOps
Free in-browser Docker playground for experiments.
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.