#1 NFT Forum

Alcor Exchange
Alcor Exchange is a decentralized exchange offering zero-fee NFT trading. Artists can list themselves for free and sell their artwork directly on the portal. It also allows for creation of NFT tokens.

Alcor Exchange has been active since 2020.
Subforums:

Arkane Market
The Arkane Network was founded in 2018 as a multiblockchain API and wallet service provider. The Belgium-based Arkane Market launched the first Polygon (Matic) NFT Marketplace in February 2021.
Subforums:

Atomic Hub Marketplace
Atomic Assets is developed by Pink Network — a group of blockchain enthusiasts active on the WAX and Proton blockchain. AtomicAssets is powered by the Eosio blockchain technology and Atomic Hub Marketplace is the platform to buy and sell NFTs. The portal is available to anyone for tokenizing and creating digital assets and to buy, sell or auction digital assets.

Atomic Assets was first launched in February 2020 and the Atomic Hub Marketplace for NFTs was launched in June 2020. At the date of first writing this review (30 March 2021), Atomic Hub claims that over 9.2 million NFTs have been created on the WAX Blockchain on the platform.
Subforums:

Axie Infinity Marketplace
Axie Infinity is a game centered around fantasy creatures called Axie. The birth place of the game is Vietnam. Axie Infinity rewards players with ERC-20 AXS (Axie Infinity Shards) tokens. At the time of first writing the review (30 March 2021), the website claimed to have more than 19,000 monthly active on-chain users.
Subforums:

Binance NFT
Binance will be releasing their own NFT Marketplace in June 2021. We will keep this page updated with the latest information about Binance NFT as soon as it has been launched. Stay tuned!
Subforums:

Crypto.com NFT Platform
Crypto.com NFT Platform is an NFT Marketplace from Hong Kong. The company operating this NFT marketplace also has a Crypto.com debit card and a crypto exchange platform. It is really a "one-stop-shop" for cryptocurrency solutions.
Subforums:

Decentraland Marketplace
Decentraland is a virtual world built on the Ethereum blockchain. It was conceptualized in the year 2017 by a public blockchain company called Metaverse Holding Ltd based out of Shanghai, China.

Decentraland opened up to the world in February 2020. Within a short period, the virtual world sold USD 1 million in digital land. Decentraland claims to be the first-ever virtual platform that is owned entirely by the users.
Subforums:

Foundation.app
Foundation has been active since 2020 and is based in the US.

If you're looking for cheap NFTs from unknown artists, you might find them here as well, but most of the NFTs minted and sold here are produced by more well-known NFT-creators. The long list of creators with NFTs sold on this marketplace includes names like * Chris *, Pak, Kevin Roose, pplpleasr, Jack Butcher etc.
Subforums:

Makersplace
Makersplace has been active since 2018 and is based in the US.

If you're looking for cheap NFTs from unknown artists, you might find them here as well, but most of the NFTs minted and sold here are produced by more well-known NFT-creators. The long list of creators with NFTs sold on this marketplace includes names like Yura Miron, Silvio Veira, Dmitri Cherniak, Dreamonaut and Frenetik Void, to name a few.
Subforums:

NBA Top Shot Marketplace
NBA Top Shot Marketplace was born when the NBA partnered with Dapperlabs, a blockchain based experience company to create the first exclusive collection of NBA digital Assets in 2020. They released their beta version at the beginning of the 20-21 basketball season, and since have sold over $400 million in gross sales at the time of first writing this review (March 2021).
Subforums:

OpenSea
OpenSea has been active since 2018 and is one of the world leaders among NFT Marketplaces. At the time of first writing this review (29 March 2021), the platform proudly claimed on their website that they are in fact the largest NFT Marketplace in the world.
Subforums:

Rarible
Rarible has been active since 2020 and is one of the world leaders among NFT Marketplaces. Rarible's main claim to fame is their seemingly endless supply of NFTs. Every type of NFT you can imagine is available here.
Subforums:

Refinable NFT Marketplace
Refineable Marketplace is an NFT trading platform backed by Binance and the American YouTuber Mr. Beast. Mr. Beast is also an entrepreneur and philanthrophist who shot to fame for pioneering the stunt video genre on his YouTube channel.

The lord of Youtube investing in Refinable and lending his name and knowledge to the project. Then to throw a humongous cherry on it all, you have Binance, the heavyweight of the cryptoverse putting on their gloves and getting ready to duke it out in the NFT battles up ahead. It's too much to handle and the NFT players are definitely going to feel the weight of this combined force as they get ready to throw down in the near future.
Subforums:

Zora Marketplace
Zora Marketplace has been active since 2020 and it is based on the ETH-blockchain.

Their core vision seems to be that they are empowering the creators. As an example from their old website where creators have not been given the full benefit of their work, they mentioned the resale price of certain sneakers (Yeezys in particular). These were rare, but costed "only" around USD 200 in the initial sale. However, certain buyers managed to buy up a large part of the available sneakers, then selling them for 2-3x, sometimes 10x, their own purchase price. But none of this ultimately lands in the pocket of the creators of the sneakers.
Subforums: