Emacs function to popup a menu to select a frame to bring the front.

tkb-select-frame-popup.el

(defun tkb-select-frame-popup ()
  (interactive)
  (let* ((frames (cl-loop for frame in (frame-list)
                          collect (cons (frame-parameter frame 'name)
                                        frame)
                          into frames finally return frames))
         (frame (x-popup-menu t `("Pick a frame" ("frames" ,@frames)))))
    (when frame
      (raise-frame frame)
      (select-frame frame))))