There are less and less exchanges that don't enforce KYC these days. Now that cryptocurrencies are going mainstream, governments/regulators/law enforcement are all watching. Ever since the shutdown of BTC-e earlier this year, Bittrex and Poloniex have instituted new verification regimes. I think they require quite a lot of personal information for new accounts now.

There is no KYC required on WEX.nz, the reincarnation of BTC-e, but given that their predecessor was shut down by the FBI, it might be a little risky trading there. Yobit is a small exchange that offers lots of altcoins (and also a BTCUSD market) that doesn't require KYC. I've never had any problems with them, but there are some complaints about them on the forum.