I can list couple of those ones, but this isn't appropriate, its better stay professional & not use this " 1st " kind of terms just to attract users's attentions.
Good luck with sales guys, not a bad project though.
When we say 1st, we mean that we're the first to actually have a marketplace running on the blockchain. We're not the first e-commerce marketplace ICO, but we're the only one with a functioning MVP which is on the Ethereum blockchain and uses smart-contracts right now.
If we're wrong, we'd love to hear of another project which actually has a fully working marketplace on the blockchain. Not just a demo, but actually using the blockchain.