Professional Market Makers

MEV-Share

Operated by Flashbots, this service enables the redistribution of MEV to users, transaction originators, or other designated parties. Users submit their transactions to a matchmaker, who partially discloses transaction details to searchers. Searchers craft MEV-generating transactions and send them back to the matchmaker, who completes the bundle with the users' transactions and sets conditions for MEV redistribution. The completed bundle is then sent to block builders, who include it in a block and enforce the redistribution conditions, thus rewarding users with a share of the MEV generated by their transactions.
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For more information read their website: 
Flashbots.net

FairMM

FairMM is designed to prevent frontrunning. through off-chain communication and on-chain settlement. Traders send orders to the market maker off-chain. These orders are hashed and committed on-chain. After a predefined period, the actual orders are revealed and executed based on the prior commitments.

For more information read the paper:
FairMM:  A Fast and Frontrunning-Resistant Crypte Market-Maker

Hashflow

Hashflow is a DEX where users can trade assets across different blockchains with guaranteed price quotes. Unlike typical AMMs used in many DEXs, Hashflow uses a request-for-quote model to provide traders with guaranteed price quotes directly from professional market makers.
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For more information read their website: 
Hashflow.com
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Rook

Rook is a DeFi protocol that aggregates liquidity and orders into a single pool where they are matched. To protect against manipulation by other actors, trades execute in a manner that conceals their intent until the transaction is finalized. Rook incentivizes participants to collaborate in capturing MEV opportunities and distributes the profits among them and Rook token holders.
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For more information read their website:
Rook.fi

FM-AMM

The FM-AMM aggregates trades in batches. Precisely, the approach sets a marginal price for each batch, determined by maximizing a predefined function that aims to establish fair equilibrium prices. The FM-AMM design addresses common issues in current AMM systems like arbitrage and sandwich attacks by eliminating immediate price impact but rather executing trades in batches.  
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For more information read the paper:
Batching Trades on Automated Market Makers