Buy Nothing Project

Their app kinda sucks since the recent update (probably vibe coded) but its exactly this. You can give things away for free, or ask things for free. Its humble.

Already mentioned but chiming in, Freecycle might be an option

Money is easy to ship anywhere. Things are much harder. Thus everything worth doing is going to be local. Various options have been mentioned. Your local food shelf may have a place for this as well.

Facebook marketplace has free things.