Drupal PHPWord
Pull requests more than welcome.
Comes without warranty and has only been used in closed-source projects, aka never "in the wild", so there's no real documentation and it's light on tests.
Will require that PHPWord is extracted to the sites/all/libraries folder, so that there exists a file named sites/all/libraries/phpword/src/PhpWord/PhpWord.php. Hopefully all dependencies should be met, but, as before, is without warranty!