Ruby Programming/Ruby editors
What is Ruby IDE ?
Integrated development environment or IDE is a software tool generally contains at least a debugger, a source code editor, and build automation tools.
There are a few of text editor/IDE that can be used for Ruby Programming language (arranged alphabetically) as shown below :
Although you can write Ruby programs with any plain text editor, some text editors have additional features to aid the Ruby programmer. The most common is syntax highlighting.
P.S 1: For the ease of readers, the book will be dealing with Notepad++ as the more popular Ruby IDE, ATOMS will be sun-setted by GitHub in 15 Dec 2022.
P.S 2: Pulsar is fork from ATOM IDE. Listed below for conveniences.
Arcadia
Price: 
(Free as in beer)
Website: https://www.arcadia-ide.org/
GNU Emacs
Price: (Free as in beer)
Website: https://www.gnu.org/software/emacs/
ICEcoder
Price: (Free as in beer)
Website: https://icecoder.net/
Komodo
Price: (Free as in beer)
Notepad++
Price: (Free as in beer)
Website: https://notepad-plus-plus.org/
Pulsar
Price: (Free as in beer)
Recommended for Freeware
Website: https://pulsar-edit.dev/
Ruby Packages: https://web.pulsar-edit.dev/packages/search?q=ruby
RubyMine
Price: 
(Annual subscription fee)
Recommended for Paidware
Sublime Text
Price: (One off payment and receives 3 years of continuous updates)
Website: https://www.sublimetext.com/
Vim
Price: (Free as in beer)
Website: https://www.vim.org/download.php#pc
References
Here is a link of spreadsheet of the various options available.
Category:Book:Ruby Programming#Ruby%20editors%20