This module adds an option to clone fields to entity create/edit pages via get parameters.
After installation you can use links like this (should be self-explanatory):
Adds external downloads as a product feature so an external url can be downloaded after purchasing. This module is a direct copy of the uc_file module modified to allow external file downloads.
This module let's drupal know about the jwerty library which can easily be used to add keyboard command support in javascript without needing to know key codes.