Open Source
Open source shaped our careers — from leading qooxdoo at 1&1 over a decade ago to the tools we rely on every day. We're grateful for that, and we give back. Today we maintain 16 production-grade projects across four languages: TypeScript developer tooling that handles the config you never want to touch. Rust-native Node.js bindings that outperform every pure-JS Markdown parser and regex engine available. On-device speech recognition for Apple Silicon that transcribes faster than real-time. Every project tested, documented, and shipped — because the community that shaped us deserves our best work.
Developer Tooling5
ESLint Config Setup
Pre-generated ESLint flat configs for TypeScript & React — 25 plugins, AI mode, OxLint-ready
Stop spending hours assembling ESLint configs from scratch. This package ships pre-generated flat configs that bundle 25 curated plugins for TypeScript and React projects. Includes an AI-assisted mode for intelligent rule tuning and is fully compatible with the emerging OxLint ecosystem.
ESLint Plugin Lingui TS
ESLint plugin for Lingui with TypeScript type-aware rules
Catches i18n mistakes at lint time instead of runtime. This plugin adds type-aware ESLint rules specifically designed for Lingui projects using TypeScript, ensuring translation keys are correct and message descriptors follow best practices.
npm-sweep
Interactive tool for managing end-of-life of your npm packages
Gracefully retire npm packages without breaking downstream users. npm-sweep provides an interactive CLI that helps you deprecate, unpublish, or transfer ownership of packages while notifying dependents and keeping the registry clean.
ResponsiveShot
Capture full-page screenshots at any viewport size
Generate pixel-perfect full-page screenshots across any viewport width for visual regression testing or documentation. Built on Playwright, ResponsiveShot handles lazy-loaded content, sticky headers, and infinite scroll pages out of the box.
python2ts
TypeScript-based Python to TypeScript transpiler using real AST transformation
Migrate Python codebases to TypeScript with confidence. Unlike regex-based converters, python2ts parses Python into a full AST and produces idiomatic TypeScript output — preserving type hints, class hierarchies, and module structure.
Libraries & Frameworks3
Ardo
React-first static documentation framework
Build beautiful documentation sites with React components as first-class citizens. Ardo generates fully static output with zero client-side JS by default, supports MDX, and ships with a fast dev server for instant feedback while writing docs.
xlsx-format
Modern XLSX reader/writer — TypeScript rewrite of SheetJS (XLSX only)
A ground-up TypeScript rewrite of the SheetJS core, focused exclusively on XLSX. Smaller bundle, full type safety, and a modern API that makes reading and writing Excel files straightforward without the legacy baggage of the original library.
ts-phonenumber
Modern TypeScript-first phone number parsing, formatting, and validation
A lightweight alternative to libphonenumber-js built entirely in TypeScript. Parses, validates, and formats international phone numbers with full metadata for 200+ countries — all with tree-shakeable exports and zero native dependencies.
Native Node.js Bindings3
Ferromark
Markdown to HTML at 309 MiB/s — full CommonMark + all GFM extensions
309 MiB/sThe fastest Markdown-to-HTML converter available for Node.js. Powered by a Rust core via native bindings, Ferromark processes CommonMark and all GitHub Flavored Markdown extensions at 309 MiB/s — orders of magnitude faster than pure-JS alternatives.
Ferroni
Pure-Rust Oniguruma regex engine with SIMD-accelerated search
6x fasterBrings the power of the Oniguruma regex engine to Node.js through pure Rust bindings. SIMD-accelerated matching delivers up to 6x the throughput of the standard JS RegExp engine for complex patterns used in syntax highlighting and text processing.
turndown-node
Convert HTML to Markdown — native Node.js bindings for Rust implementation
18x fasterTurn any HTML into clean Markdown at native speed. Built on a Rust HTML parser with Node.js bindings, turndown-node is 18x faster than the original JavaScript Turndown library while producing identical output for all supported HTML elements.
AI & Speech2
Parakeet CoreML
NVIDIA Parakeet TDT ASR for Node.js with CoreML/ANE acceleration
40x real-timeRun NVIDIA's state-of-the-art Parakeet TDT speech recognition model directly in Node.js on Apple Silicon. Leverages CoreML and the Apple Neural Engine for 40x real-time transcription speed — no Python, no GPU server, just fast local inference.
Whisper CoreML
OpenAI Whisper ASR for Node.js with CoreML/ANE acceleration on Apple Silicon
99 languagesOpenAI's Whisper model optimized for Apple Silicon via CoreML. Supports 99 languages with automatic language detection, runs entirely on-device using the Neural Engine, and integrates natively with Node.js — no cloud API calls required.
Data & Encoding3
pofile-ts
Modern library for reading and writing GNU gettext PO files, hand-optimized for speed
20x fasterA complete rewrite of the classic pofile library in modern TypeScript. Hand-optimized parsing is 20x faster than the original while supporting all PO features including plural forms, contexts, and translator comments.
Effective Rison
URI-friendly JSON encoding with Rison format
Encode complex JSON objects into compact, URI-safe strings without percent-encoding overhead. Effective Rison implements the Rison format with a focus on correctness and small bundle size — ideal for passing structured data in URL query parameters.
Offcourse
CLI tool to download online courses for offline access with Markdown lesson text
Download entire online courses for offline study. Offcourse extracts video, subtitles, and lesson text from popular platforms and saves everything as neatly organized Markdown files — perfect for learning on the go without an internet connection.