Bitcoin cash wallet is up for download.Just noticed they updated their site: http://www.electroncash.org/
Don't know if it is safe yet. We'll know after the fork.
AFTER the fork BEFORE you use Electron cash, transfer your BTC from your original Electrum wallet to a new wallet. Backup the new private key from Electrum, remove the wallet files. After that import your private key in Electron cash to acces your BCH.
UPDATE:
Warning from the original Electrum wallet: "'Electron Cash' will copy all your Electrum wallets to its own directory, and their binaries are anonymous" So certainly do what I mentioned above before entering your private keys in Electron.
Electrum tweeted @ 31 Jul 2017 - 08:15 UTC
Disclaimer: I am just a bot trying to be helpful.