GNU/Linux is not freeware,but it
Free Libre Open Source Software(FLOSS) as u can modify the source which is supplied and distributed.the Licence which holds this is GPL.
hence not freeware,but free software.read more about Open Source and FLOSS here in wikipedia.
*en.wikipedia.org/wiki/Free_Software
Free software, as defined by the Free Software Foundation, is software which can be used, copied, studied, modified and redistributed without restriction. Freedom from such restrictions is central to the concept, with the opposite of free software being proprietary software (a distinction unrelated to whether a fee is charged). The usual way for software to be distributed as free software is for the software to be licensed to the recipient with a free software license (or be in the public domain), and the source code of the software to be made available (for a compiled language).
*en.wikipedia.org/wiki/Freeware
and freeware is
Freeware is copyrighted computer software which is made available for use free of charge, for an unlimited time, as opposed to shareware where the user is required to pay (e.g. after some trial period). Authors of freeware often want to "give something to the community", but also want credit for their software and to retain control of its future development. Often, when programmers decide to stop developing a freeware product, they will give the source code to another programmer or release the product's source code as to the public as free software.
So use FLOSS,support this thriving futurisitc idea.use GNU/Linux.