These are auxiliary RubyMotion commands. Some are provided by the community. Some are provided by RubyMotion proper. Having these commands outside of RubyMotion allows for out of band release/updates to the open source pieces of RubyMotion.

To author a command, create a starting point:

module Motion; class Command
  class YourCommand < Command
    self.summary = "summary"
    self.description = "summary"

    def run
       puts "hello world"
    end
  end
end; end

You can locally run the command. Start irb and execute the following:

>$:.unshift '/Library/RubyMotion/lib'
>load '/Library/RubyMotion/lib/motion/command.rb'
>load './your_command.rb'
>c = Motion::Command::YourCommand.new []
>c.run

If you need to make updates, change the source file and run:

load './your_command.rb'
c.run