Can't remember who did this. Happy to attribute the credits. Write to me.
Matcha - Get early access
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DEX Aggregator - 1inch.exchange
0x: Powering the decentralized exchange of tokens on Ethereum
Also has a linux/windows bot to run a market making bot.
Nuo - Lend and Borrow Cryptocurrency
We just shipped a gasless way to swap tokens with meta transactions and aggregated liquidity across DEXs. You can also use it without metamask. So: