Free
CyberChef
Open SourceEncoding & Decoding
The Cyber Swiss Army Knife: encode, decode, hash and transform data in the browser.
encoderdecoderhashbase64
Browse the complete directory — use filters to narrow down.
Encoding & Decoding
The Cyber Swiss Army Knife: encode, decode, hash and transform data in the browser.
Orchestration · DevOps
The open-source system for automating container orchestration.
Relational · Database
The world's most advanced open-source relational database.
Pipelines & ETL · Data & Analytics
The standard open-source orchestrator for data pipelines.
Other Formats · Data Formats
Data serialization system commonly used with Kafka.
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.
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.
Hooks & Commits · Git & Version Control
Specification for structured, human and machine-readable commit messages.
Relational · Database
Fast in-process analytical (OLAP) SQL database, like SQLite for analytics.
Hosting & Collaboration · Git & Version Control
Community-driven, self-hosted software forge (powers Codeberg).
Stock & Placeholders · Image & Media
Collaborative database of CC-licensed sound effects and samples — the go-to library for UI sounds and foley.
Hosting & Collaboration · Git & Version Control
Lightweight, self-hosted Git service written in Go.
Web Analytics · Monitoring & Observability
Google's free webmaster console — indexing status, search queries, sitemaps and Core Web Vitals data.
APM & Tracing · Monitoring & Observability
Open-source distributed tracing platform, CNCF graduated.
References · Documentation & Learning
The Modern JavaScript Tutorial — the deepest free JS reference from basics to advanced browser APIs.
CI/CD · DevOps
The classic open-source automation server for CI/CD.
JSON · Data Formats
Official site of the JSON Schema specification, with tools and validators.
Notebooks & Data Science · Data & Analytics
The standard interactive notebooks for data science and ML.
JWT · Encoding & Decoding
The official JSON Web Token site: decode, debug and find libraries.
Models & LLM APIs · AI for Developers
Open-source LLM gateway: one API for 100+ providers.
Models & LLM APIs · AI for Developers
Meta's open-weight LLM family with downloadable weights.