Freemium
Bitwarden
Open SourcePasswords & IDs · Security
Open-source password manager with a free generator and vault.
passwordsmanageropen-source
Browse the complete directory — use filters to narrow down.
Passwords & IDs · Security
Open-source password manager with a free generator and vault.
Scheduling & Booking · API Tools
Open-source scheduling infrastructure — Calendly alternative with booking links, teams and an API you can self-host.
Learning & Reference · CSS Tools
Browser support tables for HTML, CSS and JavaScript features.
Design Systems · Design & Prototyping
IBM's open-source design system for products and experiences.
Text & Diff · Developer Utilities
Create and share beautiful images of your source code.
Browser DevTools · Development Environment
The browser console's full documentation — elements, network, performance, memory and Lighthouse panels.
NoSQL · Database
Blazing-fast columnar database for real-time analytics.
Generators · CSS Tools
Visual clip-path shape maker generating CSS polygon values.
Color Tools
Color blindness simulator: upload an image and preview eight vision types.
Relational · Database
Distributed, PostgreSQL-compatible SQL database built for resilience.
Other Formats · Data Formats
Large collection of online formatters, validators and converters.
Practice & Challenges · Documentation & Learning
Community-driven coding kata platform across many languages.
Color Tools
Collection of color tools: converter, palette, gradient and contrast.
Color Tools
Curated, community-voted color palettes.
Color Tools
Simple online color picker with HEX, RGB and HSL outputs.
Agent & LLM Frameworks · AI for Developers
Node-graph UI for Stable Diffusion and other generative models.
Hooks & Commits · Git & Version Control
Specification for structured, human and machine-readable commit messages.
Serverless & BaaS · Database
Reactive backend platform with a realtime TypeScript database.
Self-Hosted PaaS · Cloud Platforms
Open-source, self-hosted Heroku/Netlify alternative.
Stock & Placeholders · Image & Media
Beautiful free stock videos for websites — curated clips optimized for hero sections and backgrounds.
Time & Cron · Developer Utilities
Quick editor and plain-English explainer for cron schedule expressions.
SSL & TLS · Security
Search certificate transparency logs for any domain.
Headers & CSP · Security
Google's tool to evaluate and debug Content Security Policies.
Generators · CSS Tools
Visual generator for CSS gradients with ready-made code.