I was just looking for something like this recently. This would be extremely useful to know how much of a bitcoin fork you own by simply entering your addresses at the block height when the split happens, then you would get the total balance you own on the forked chain.
You can manually use block explorers for the different forks.
I use
this one for Bitcoin Cash,
this one for Bitcoin Gold, and
this one for BitCore (technically BitCore is an airdrop, not a fork, but the result is the same: money connected to your private key.
I hope someone can craft something that manages this for you automatically. You would only need to enter public addresses so no problems of losing coins.
I kinda expect multi-coin-wallets will evolve if the forks keep coming. I now have to import the same private key several times into Coinomi, I can imagine in the future Coinomi or another wallet can automatically import all possible chains at once.
@TryNinja (under): thanks, I've bookmarked the link.