We're awaiting StarkWare's release of ERC20's on StarkNet. Then we will reopen our testnet.
Our StarkNet testnet can be found on our website: https://trade.zigzag.exchange/. Right now, we've implemented an inbrowser wallet that automints fake tokens. The orderbook and limit orders are real, but functionality is limited. We are aware of all the bugs and errors.
GitHub - ZigZagExchange/starknet-contracts