Hey, so far, I have only heard of Kucoin. They announced that they will support all the upcoming forks, at least it is stated here: https://news.kucoin.com/en/announcement-regarding-ethereum-fog-and-other-fork-coins/
However, this is only helpful for the upcoming forks.
Also Binance (https://www.binance.com) had supported some of the forks (e.g. Bitcoin Diamond, BitcoinX), but not all of them.