Hate to be that guy who thinks his startup has all the solutions, but we’re building exactly this platform over at Provender.
*shameless plug begins*
If you want to take a look at some of the production/logistics stuff we do without signing up, you can go to-
http://blog.provender.com/about/- learn about our platform
http://www.menuplanting.com/- app for buyers to request seeds from local farmers and get matched with a grower who is right for them
http://costing.provender.com/ — app for farmers to plan logistics and delivery without the hassle of excel.
Just a taste of how we build software for a better food system!
*shameless plug ends*