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While it is probably the most customizable and flexible gem for file uploads, it might be too complex. I personally prefer to use a paperclip, carrierwave, or activestorage when I need to have just a simple file upload.

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.

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.

The best gem for authentication. Very easy to add and extend if needed. For stronger security, you can easily integrate it with https://github.com/phatworx/devise_security_extension

Amazing gem to integrate powerful search capabilities into your Rails application, on top of Elasticsearch. I recently used it to build a global "cross-model" smart search for a CRM. It even supports useful features, like: misspellings, suggestions, stemming, ... and can reindex data with no downtime.

Incredible library enables you to craft captivating 3D graphics experiences seamlessly within web environments .

I used it to develop Zikogl, A WebGL plugin for the Zikojs Library.