The "Gift economy" is another vision of mutual aid.
Most traditional societies were practicing a form or another of gift economy, basically the idea is that when you are gifted something you feel obligated to return another gift.
So if your neighbor gives you the extra apples he gets from is orchard, then you feel obligated and later you might give him extra potatoes, or offer to help him if you see him find work in his roof ...
The constant gifting and reciprocating gifts is how this traditional form of economy runs. Unlike what economists are thinking, bartering was very rarely used in the economy of traditional societies.
This form of economy is building and consoliding communities.