Efty is not free but it is cheap. It is essentialy for good landing pages and negotiation. Sales need to be finalized using another service. It has tracking. Bodis mostly for parking. Free ? It must have some tracking. Has its own marketplace? Has its own Escrow? ... correct? ... I don't have familiarity with either. But I will test Bodis for parking. I may test Efty as well. I may also test Afternic fast transfer. Sedo is ok, but most domains don't sell although they should, maybe because of poor landing page, or that most people use Godaddy. Also considering undeveloped.com . Too much time needed to manage. Still not started outbounding seriously. Domaining still not worth the effort despite some 4 fig sales.