Starting code for the GildedRose Refactoring Kata in many programming languages.

A curated list of data engineering tools for software developers

Master the command line, in one page

A CLI for scaffolding and running Advent of Code solutions in Ruby.

The Ruby Programming Language [mirror]

tmux source code

A handy tool for doing efficient in-memory commit rebases & fixups

Systems design is the process of defining the architecture, modules, interfaces, and data for a system to satisfy specified requirements. Systems design could be seen as the application of systems …

A framework for Engineering Managers

Master programming by recreating your favorite technologies from scratch.

Risk-First Software Development

Learn how to design large-scale systems. Prep for the system design interview. Includes Anki flashcards.

A collection of modern/faster/saner alternatives to common unix commands.

The OWASP Cheat Sheet Series was created to provide a concise collection of high value information on specific application security topics.

Parallel computing with task scheduling

A cat(1) clone with wings.

Property Testing library in Ruby