Free
Apache Cassandra
Open SourceNoSQL · Database
Distributed, wide-column NoSQL database for massive scale.
cassandranosqldistributed
Browse the complete directory — use filters to narrow down.
NoSQL · Database
Distributed, wide-column NoSQL database for massive scale.
Queues & Streaming · Database
The industry-standard distributed event streaming platform.
Dashboards & BI · Data & Analytics
Powerful open-source data exploration and visualization platform.
API Clients · API Tools
All-in-one API platform for design, debug, mock, test and document.
CI/CD · DevOps
Declarative GitOps continuous delivery for Kubernetes.
Documentation Generators · PDF & Documents
Astro's documentation framework — fast, accessible docs sites with search, i18n and sidebar tooling built in.
Design Systems · Design & Prototyping
Atlassian's design system with components and content guidelines.
Authentication · API Tools
Okta's identity platform for authentication and authorization.
Hyperscalers · Cloud Platforms
Amazon Web Services: the largest cloud platform with 200+ services.
Inspiration & Galleries · Design & Prototyping
Awards panel ranking the most innovative web design — the frontier of what the web can look like.
Accessibility · Testing
Industry-standard accessibility testing engine and browser tools.
Whiteboards & Diagrams · Design & Prototyping
Low-fidelity wireframing that keeps the focus on structure.
Converters · Encoding & Decoding
Simple, fast online Base64 decoder and encoder.
Converters · Encoding & Decoding
Base64 encode and decode for text, files, URLs and images.
Uptime & Alerting · Monitoring & Observability
Uptime monitoring, incident management and log management in one.
Hosting & Collaboration · Git & Version Control
Atlassian Git hosting with deep Jira integration.
Passwords & IDs · Security
Open-source password manager with a free generator and vault.
Illustrations & Assets · Design & Prototyping
Customizable illustrations from global artists — compose scenes in the browser and export to PNG or SVG.
AI Coding Assistants · AI for Developers
Prompt, run, edit and deploy full-stack web apps in the browser.
E2E & Browser · Testing
Test on real browsers and devices in the cloud.
Error Tracking · Monitoring & Observability
Error monitoring with strong mobile and release health support.
Courses & Tutorials · Documentation & Learning
Kelas online UI/UX dan web development berbahasa Indonesia dengan studi kasus portofolio dan akses selamanya.
Courses & Tutorials · Documentation & Learning
Alex Xu's visual system design courses and newsletter — architecture explained with diagrams, not jargon.
Scheduling & Booking · API Tools
Open-source scheduling infrastructure — Calendly alternative with booking links, teams and an API you can self-host.