Final answer:
The form of software that is not free among the options provided is 'Packaged.' Public Domain, Open Source, and Freeware are all free forms of software, while Packaged software generally costs money.
Step-by-step explanation:
The form of software that is NOT free is packaged software. Packaged software typically comes at a cost and is often produced by commercial software companies. On the contrary, public domain software is free because it is not protected by copyright and anyone can use it without any restrictions.
Open source software is free to use, modify, and distribute, typically under licenses that maintain its free nature and availability.
Finally, freeware is also free to use, but it might have restrictions on redistribution or modification as determined by the author. Therefore, 'Packaged' is the correct answer as it does not belong in the list of free software forms.