In my profession (UNIX/Linux and *BSD environments) Open Source is commonly used. My personal vision is that Open Source does not specifically imply free. Let's see what a randomly selected group of people answer to the question:
"Is Open Source software Free software?"
Person 0: No, for example Linux is not free; you are not free to do what you want.
Person 1: Open Source is not Free Software. Open Source is possibly free.
Person 2: Linux is financially free.
Person 3: Yes, Open Source software is free.
Wow, the answers are actually not what I expected. There is a difference in interpretation of Free. Lets take a look:
It seems that I was only thinking about the financial side of free and had forgotten about the functional aspects of free!