The companion gem of "Learn Ruby with Chunky Bacon", an interactive Ruby course that runs in the browser. require "chunky_bacon" gives a program the course's helpers - show_image, show_pdf, show_browser, download_file, mock_get, show_irb, show_files, run_tests, install_gem - so code written in the course runs unchanged with plain Ruby; `chunkybacon run` starts a program with them loaded. Pure Ruby, no dependencies.