https://christoph.luppri.ch/articles/2017/06/26/single-file-rails-applications-for-fun-and-bug-reporting/ (single-file Rails apps)

http://dejimata.com/2017/5/20/the-ruby-module-builder-pattern (Ruby module builder pattern)

https://github.com/SciRuby/iruby
https://github.com/zeromq/czmq zeromq - iRuby in Jupyter notebooks