Many donated items end up in landfills because they're sent to organizations that don't need them. A smart matching system would analyze what charities actually need and connect donors directly.
Build a web platform where charities list their current needs, and donors can see exactly where their items will do the most good.
Nonprofits might pay for premium features, or you could take a small percentage of monetary donations facilitated through the platform.
Start with a simple web form for charities to list needs and a map interface for donors.
The challenge is getting enough participation from charities to make the matching work.