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Top library to render graphics inside an HTML canvas. You can draw shapes, text, images, videos, ... and then manipulate them: drag&drop, resize, rotate, ... I used to build a web based, quite complex, image editor.

Probably the best gem if you need an HTTP client. I like that it constantly improving and I see new releases.

Also, I like that it has a nice feature -middleware support.

Super useful CLI utility to count lines of code of basically any language 👌 It can also output results in other formats like JSON, CSV or YAML.

Nice and lightweight wrapper around the Calendly API, for Ruby apps.

Very useful gem to run distributed "cron" tasks over Redis. It works with minimal setup, you just need to define a YAML with your tasks and their scheduling time (that can be defined in natural language: "every 6 hours").

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.