Open Source Packages
Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.
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gray-matter
Fast, dependable front-matter parser for YAML, JSON, TOML, and CoffeeScript metadata blocks
prom-client
The de facto Prometheus client library for instrumenting Node.js applications with counters, gauges, histograms, and summaries.
fast-glob
A very fast and efficient glob library for Node.js
cookie
Basic HTTP cookie parser and serializer for HTTP servers, with zero dependencies and full RFC 6265 support.
toml
A native Rust encoder and decoder for TOML with first-class Serde support.
strip-ansi
Strips ANSI escape codes from strings — the small, fast utility Node.js later built directly into its own core API.
ECharts
A powerful, interactive JavaScript charting and data-visualization library for the browser.
jQuery
A fast, small, feature-rich JavaScript library for DOM traversal, event handling, animation, and Ajax with a concise, chainable API.
react-use
Over 100 ready-made React Hooks covering sensors, UI, animations, side effects, lifecycles, and state — batteries included.
styled-components
Write actual CSS in your React components and let styled-components scope, inject, and dedupe it at runtime.
mocha
The classic, battle-tested JavaScript test framework for Node.js and the browser, built around flexible async testing and pluggable reporters.
mypy
Optional static type checker that catches Python bugs before you run your code
react-window
Virtualized React components for rendering large lists and tabular data without the performance cost.
canvas-confetti
A zero-dependency JavaScript library for firing performant, physics-based confetti animations on an HTML canvas.
vue-tsc
A command-line type-checking tool that teaches the TypeScript compiler to understand Vue single-file components.
websockets
Build correct, fast WebSocket servers and clients in Python with asyncio, threading, or Sans-I/O APIs.
express-rate-limit
Basic IP rate-limiting middleware for Express to throttle repeated requests and protect public APIs and sensitive endpoints.
quote
The quasi-quoting library that turns Rust syntax into token streams for procedural macros.
zod-to-json-schema
Converts Zod validation schemas into standard JSON Schema, ready for OpenAPI, OpenAI, and JSON Schema draft 7 consumers.
pytz
World timezone definitions for Python, powered by the IANA (Olson) tz database.
three.js
The cross-browser JavaScript 3D library that renders scenes through WebGL and WebGPU behind one unified, node-based shading API.
knex
A flexible, portable SQL query builder for Node.js supporting PostgreSQL, MySQL, CockroachDB, SQL Server, SQLite3, and Oracle.
@cloudflare/workers-types
Official TypeScript type definitions for the Cloudflare Workers runtime, covering fetch handlers and platform bindings like KV, D1, R2, and Durable Objects.
web-vitals
web-vitals: Measure Core Web Vitals in the Browser
