I think what you're asking is: "Are there any websites with lists of plants tortoises can eat?"
and the answer is yes. What species do you have? Most of our species forums have at least a rough list of suitable plants.
your best bet is to buy seeds, plant them, and let your tortoises graze on that. theres a seed thread in the Tortoise Food forum
Here are some links to sites that sell actual plants /weeds/flowers and veg. You can also type in Organic Produce on your search engine and find lots of places to purchase plants etc from for both people and torts.
What Robyn said!! But you can also buy seeds and throw them in the enclosures and your torts will be able to graze.. another site would be www.turtlecafe.com or http://gurneys.com/default.asp?bhcd2=1205533754 they sell everything.. just make sure whatever you do use has no pesticides or fertilizer on them.