Try google and type ''Free forum hosting'' Google is your best friend 

Use your search engines, like pker own suggested.  That's what people would have to do to get them to you.  It's faster to do it yourself.

This would be like asking,
"I need a list of ALL of the grocery stores in the entire world"

There's a lot. Google them.
All of the free ones usually lack support and you have to pay for better support.
All of the paid ones provide generally good service..usually. But you have to shop around and check reviews.