Marketplaces
An online marketplace (or online e-commerce marketplace) is a type of e-commerce site where multiple third parties provide products or services.

LooksRare
LooksRare is the community-first NFT marketplace that actively rewards traders, collectors and creators for participating

Blur
Blur is a zero fees NFT marketplace, with a fast UI, portfolio management tools and advanced analytics.

Foundation
Foundation is a marketplace platform for buying, selling, and trading limited-edition goods.

Gem
Gem.xyz is an NFT Aggregator. You can buy multiple NFTs(aka sweep floor) using Gem Web 3 shopping cart, pay with any token and save up to 39% on gas fees.

Gitcoin
Gitcoin is a marketplace of freelance gigs and bounties for open source projects.

Knownorigin
KnownOrigin lets you discover, showcase & buy digital artwork + NFT collectibles.

NFTKEY
NFTKEY is a decentralised NFT marketplace that allows Ethereum and Binance Smart Chain NFTs to be listed, bid on, bought and sold without any centralized servers

OpenSea
OpenSea is a peer to peer marketplace for crypto collectibles. Interview with OpenSean co-founder Devin Finzer.

Rarible
Rarible allows you to create and sell NFT collectibles at digital art marketplace. Interview with Alexei Falin, CEO and co-founder of Rarible

Superrare
SuperRare is a marketplace to collect and trade unique, single-edition digital artworks.

X
X is a community-owned, cross-chain NFT marketplace. X enables users to collect, create and sell NFTs across multiple blockchains on the decentralized marketplace.