Mainstream languages: you may now bow to Ruby.

require 'rubygems'
require 'binding_of_caller'
module Kernel
  def debug
    Binding.of_caller do |b|
      var_types = ['local','instance','self.class.class'] #,'global']
      var_types.each do |var_type|
        puts "#{var_type.split('.')[-1].capitalize} variables:"
        eval(var_type+"_variables",b).each do |var|
          puts "#{var} = #{(eval var,b).inspect}" unless var =~ /gempath_searcher/
        end
      end
    end
  end
end

Perfect for script/breakpointer in a Rails app.