Earlier quoted context omitted.
They absolutely do NOT mean the same thing. There is open source software that requires payment to obtain. There is open source software that you are not free to do whatever you want with (non-libre) There is software available at no cost which is neither open source or libre. Just about every permutation of these 3 concepts has some actual example in the real world. Please do not promote the idea that they are in an…
What is an example of open source software that is not libre? Like the other commenter said, the F in F(L)OSS does mean free as in speech, not necessarily free as in beer.
One example I am familiar with is an (old) project called LinuxSampler. It was (probably incorrectly) licensed GPL+modification clause that prevented its use in any commercial hardware project.
There have been some other projects that are released under what might be termed "GPL-but-no-military-use".