You should also add Bisq (formerly Bitsquare) to your list. It has been up and running for two years and it's volume is growing steadily. You can do both crypto <-> crypto and fiat <-> crypto trades there. It also run behind Tor network, so there's an additional layer of security/anonymity. Similarly to Blocknet, orders are broadcasted in peer-to-peer fashion and each client compiles its own orderbook, so there's no need for third party order books hosts.