I'd like to know which
gedit plugins I could install to make programming for Ruby and Ruby on Rails easier?
Some more hints can be found here: https://rbjl.janlelis.com/22-rubybuntu-4-make-gedit-better-than-any-ide. Some commands for the "external commands" plugin (e.g. "run in irb") can be found in this post: https://rbjl.janlelis.com/23-gedit-external-tools-ruby-helpers-git-integration-and-more
2020 Update: As Crimbo noted, this might be outdated now...