Rube Goldberg Hello World
Foo → gs2 → M → Jelly → Retina → Aeolbonn → Par → Actually → Sprects → sed → Universal Lambda → Lines → /// → m4: 19/13 ≈ 1.4615 points

"“GḋÞḊCøẉYỴ⁴ñ&lt;ȯƥ»Ṿ¦


All answers are given in the Jelly code page. ¶ represents a newline.

Mechanism

  Language      Code
 ——————————————————————————————————————
  Foo           "“GḋÞḊCøẉYỴ⁴ñ&lt;ȯƥ»Ṿ¦
  gs2           “GḋÞḊCøẉYỴ⁴ñ&lt;ȯƥ»Ṿ¦
  M             “GḋÞḊCøẉYỴ⁴ñ&lt;ȯƥ»Ṿ
  Jelly         “¶:`".c Rube Goldberg#\/”
  Retina        ¶:`".c Rube Goldberg#\/
  Aeolbonn      :`".c Rube Goldberg#\/
  Par           `".c Rube Goldberg#\/
  Actually      ".c Rube Goldberg#\/
  Sprects       .c Rube Goldberg#\/
  sed           c Rube Goldberg#\/
  U.Lambda       Rube Goldberg#\/
  Lines         Rube Goldberg#\/
  ///           Rube Goldberg#/
  m4            Rube Goldberg#


EDIT: Oops, there was an error in the Pyth program. I replaced Pyth and GolfScript by Par.

EDIT 2: Added GNU m4.

EDIT 3: Added Foo and M.