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

An excellent gem to mock (and "record") your requests in the specs.

Sometimes a bit annoying to re-record cassettes, but not a big deal.

Every Ruby/Rails dev must know this gem.

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.

A good gem to create a simple PDF, but the main risk I see is that the last release of the gem happened in 2020. Also, you cannot "edit" PDFs with it. So in my case I used "hexapdf" gem

A must-have solution for your Rails app. If you doing anything bigger than a landing page you should use this gem. Easy to configure and by adding even the most basic rules you can protect your site from DDOS.

Of course, you can also use Cloudflare but depending on requirements this gem is also a nice option.