Sakumar79,
FOSS is subset of freeware
Foss is
NOT a subset of freeware.
What is FOSS? Here is the definition from wikipedia
The first formal definition of free software was published by FSF in February 1986. That definition, written by Richard Stallman, is still maintained today and states that software is free software if people who receive a copy of the software have the following four freedoms. (The numbering begins with zero since many computer systems use zero-based numbering.)
Freedom 0: The freedom to run the program for any purpose.
Freedom 1: The freedom to study how the program works, and change it to make it do what you wish.
Freedom 2: The freedom to redistribute copies so you can help your neighbor.
Freedom 3: The freedom to improve the program, and release your improvements (and modified versions in general) to the public, so that the whole community benefits.
Freedoms 1 and 3 require source code to be available because studying and modifying software without its source code is highly impractical.
Thus, free software means that computer users have the freedom to cooperate with whom they choose, and to control the software they use. To summarize this into a remark distinguishing libre (freedom) software from gratis (zero price) software, the Free Software Foundation says: "Free software is a matter of liberty, not price. To understand the concept, you should think of 'free' as in 'free speech', not as in 'free beer'".[17] See Gratis versus libre.
^^it says:
"Free software(FOSS) is a matter of liberty, not price. To understand the concept, you should think of 'free' as in 'free speech', not as in 'free beer'"
And GPL license makes it clear that, you can sell a FOSS app as long as the above four right of the buyer are intact. In fact there there a many FOSS apps that are not free(in sense of "price"), you have to buy them. Its true that most of the FOSS apps are free(you do not have to buy).
In contrast, FREEWARE means: (from wikipedia)
"Freeware (from "free" and "software") is computer software that is available for use at no cost or for an optional fee,[1] but usually with one or more restricted usage rights"
So, its clear that FOSS and FREEWARE are totally different terms. Main goals of FOSS licensed apps are to ensure the users' FREEDOM to copy,distribute and modify the software. Price doesn't play any role here. Whereas the freeware is only about money.
Its totally wrong to call or classify FOSS apps as 'freeware", only because you don't have to buy them.
FOSS indicates the software is both free as well as open source.
I feel that, to say "free" you meant, "no need to spend money", which is wrong. "Free" in "Free and open source software", doesn't mean "price", rather, it means "freedom". (freedom to copy,modify and redistribute). This is why, if I say "xyz software is FOSS", doesn't mean you don't have to buy it. It means, you may have to buy it if the author demands a price, you don't have to buy it if the author publish it freely(without price). But, in both cases you have the FREEDOM to modify and redistribute.
Hope the above discussion clears the confusion about "feeware" and "foss"