Objkt

Creator opens a collection and then mints tokens into that collection. It is possible to have more than one collection.
There is a constantly updating list of live offers, mints and sales.
Two types of auctions are supported. In an English auction, the highest bid wins in a set period of time, and in a Dutch auction, where the price is set high and then declines slowly until a buyer accepts the price.
This is the largest marketplace on the Tezos blockchain.