Grow your own food. Share what you can't use
I started a jalapeño pepper plant two years ago that's been popping out peppers like crazy. I hate peppers, so I give them to anyone who wants them around town.
I do not share tools though, they never seem to come back. If you need a tool or something I have, as long as you don't mind a furry foul mouthed Canadian I'll gladly come help though and bring them along.