Seems like a work in progress, but a great idea. 
Graines de Troc
It is a online platform where everyone can share and trade seeds. We all build the same available list. Each shipment of seeds is worth a token that allows members to choose any variety in the list. Swapping is an opportunity to try another sharing system. Graines De Troc make it easy and magical. All seeds, except hybrids, can be shared. The web is fine, but we also encourage and promote every local swap.