I found this list on another site so credit where due. I thought it would be really handy to have it here.
To make the list, sites have to be completely free for the long term(no basic listing fees, no Final Value Fees). Free trials or credits do not apply. As long as the basic listings are free, sites that charge for upgrades are OK....so be careful when listing, as listing upgrades may carry fees! I still have a long way to go on the niche site part of the list...
All sites on this list DO NOT require a cc# to sell.