Hidden Gems Challenge

Hi!

Choose one alternative or unusual Ruby gem that you’ve used again and again or one that has inspired you in some way, and share it in this topic.

No explanations.
No reviews.
Just README links.

Please don’t post more than once.

Too hard to pick one.

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@javier.cervantes Thanks for suggesting minitest-difftastic, looks like a must have I didn’t know I must have until now. :smiley:

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The dual-booting strategy and some handy reports next_rails offers is a must for me

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