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Middleman is underrated. It's still one of the best frameworks to build static sites. It works nice for simple websites, for blogs, and due to some of its features (data + proxy + config as code), you can also build more sophisticated static web-apps.

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Lightweight and useful package to sort your HTML tables. Easily customizable via data-* attributes.

Wonderful library, a really cool project that allows you to build simple charts in console apps.

The best framework to build CLI applications in Ruby. It has a "core" package and then each component/feature (colors, prompts, tables, ...) is distributed as a different gem, so you install only what you need.

This simplifies a lot the way you run your services and the error or success management. Great idea!