rubo-format VS awesome-ruby

Another example: code formatters. You mention gofmt (which you incorrectly put next to Ruby even though it's for Go)... There are lots of code formatters for Ruby, even if you only consider ones directly inspired/influenced by gofmt. A quick google turned up at least three of those: https://github.com/pariz/rubo-format, https://github.com/penelopezone/rubyfmt, and https://github.com/ruby-formatter/rufo. I'm pretty sure rubocop is used in Ruby more than any of those, but rubocop is less directly influenced by gofmt. So what do you choose? The project(s) that's more closely analogous? Or the more popular formatter?

Rails will always be a core pillar, but Ruby is a general purpose language with plenty of other applications. I would encourage you to look at some of the projects in https://awesome-ruby.com/ before declaring it "dead for everything but Rails."

Thanks, I used the awesome list for ruby for forever. Great resource

My current practice : I compare the different "awesome" sites : https://github.com/avelino/awesome-go , https://github.com/vinta/awesome-python , https://github.com/markets/awesome-ruby but I wonder if there is a better method.

Awesome Ruby - a community-driven collection of essentials to build web applications in Ruby on Rails: libraries, tools, frameworks, and software.

There are a lot of Ruby gems for sure. Checkout https://awesome-ruby.com/ which has suggested gems for several categories including an Excel one such as Roo or Spreadsheet Architect. Also can keyword searches a bit with the official gem repository at https://Rubygems.org