Just like @OmegaStarScream have stated, peruse that link and you might find one that fits into the profile you wanted. But the ''free'' will come with a cost which might necessarily be parting away with fees. Just be ready to comply to the list of things they might require you to do which might not be so for those who are willing to pay certain fee for listing. Some conditions might be that some of your coins must be held in escrow not to be in the market while others might put some stringent conditions that you might risk delisting should the volume on your coins fall below certain range.