SuiteCRM package builder is a small PHP script which eases the pain of building a SuiteCRM package for installing changes to other instances. It simply requires a SuiteCRM install and a compliant manifest file.
This means you can build up the bulk of the package just by running something similar to:
suitecrmpackagebuilder /var/www/mySuiteCRMInstance/manifest.php /var/www/mySuiteCRMInstance/ SuiteCRMPackage.zip
It can be found on my GitHub page here: SuiteCRM Package Builder.
As always you should back up any instance before running code from a stranger on the internet.