BITTREX - yes:
https://support.bittrex.com/hc/en-us/...
"If you have a Bitcoin (BTC) balance on Bittrex 24 during the BCC UAHF time on August 1st, 5.20am (12.20pm UTC), you will be credited the equivalent amount of Bitcoin Cash (BCC) on a 1:1 basis. i.e. 1 BTC on Bittrex held during the on-exchange snapshot will get you 1 BCC."
BITFINEX - yes:
https://www.bitfinex.com/posts/212
"BCH will be distributed to settled bitcoin wallet balances as of the UTC timestamp of the first forking block, which is expected to occur on August 1st, 2017.
The token distribution methodology will be:
All BTC wallet balances will receive BCH"
KRAKEN - yes:
http://blog.kraken.com/post/1150/bitc...
"All Kraken clients holding Bitcoin (XBT) balances at the time of the fork will be credited with an equal amount of Bitcoin Cash (BCH)"
POLONIEX – no:
https://poloniex.com/press-releases/2...
"At this time, we cannot commit to supporting any specific blockchain that may emerge if there is a blockchain split. Even if two viable blockchains emerge, we may or may not support both and will make such a decision only after we are satisfied that we can safely support either blockchain in an enterprise environment."
COINBASE – no
https://blog.coinbase.com/update-for-...
"This means if there are two separate digital currencies — bitcoin (BTC) and bitcoin cash (BCC) — customers with Bitcoin stored on Coinbase will only have access to the current version of bitcoin we support (BTC). Customers will not have access to, or be able to withdraw, bitcoin cash (BCC)."
Wallets where you control your private keys
Mobile:
Electrum
Mycelium
Copay
Bitcoin Wallet for Android
breadwallet
Simple Bitcoin Wallet
Desktop:
Bitcoin Core
Electrum
Bitcoin Knots
mSIGNA
Armory
Bither
ArcBit
Copay