I don't think there are free reseller honstly I never seen one. It makes no use to the provider also, There losing alot of money if they support or give free resellers out because the person with the reseller is making all the money and a big profit.
I haven’t idea for free reseller, but all suggestion they give for you that’s the best choice, you can review each other. I hope you can found what you want and what you need.
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Even if you find one i can just imagine that how bad everything will be on it probably over loaded servers, no support what so ever downtime like everyday... I don't know if i would even waste my time with something like this..
A permanent free reseller hosting account would be hard to find. The minimum space/bandwidth any reseller would need in order to freely operate as a web host and create resold accounts is 2GB sapce and 15GB bandwidth. I'd be surprised if anyone's willing to offer that much absolutely free of charge, unless of course it's for a limited period only.