The best, most secure and stable wallet is the full node wallet, also known as the swing wallet: https://github.com/btcz/bitcoinz-wallet/releases

Also available is a community managed bitpay wallet fork, available at https://github.com/bitcoinz-wallets/bitcoinz-copay-wallet/releases with builds for iOS and Linux.

Android wallets:
- https://play.google.com/store/apps/details?id=com.btczcom.btcz (community managed)
- Coinomi Wallet: https://play.google.com/store/apps/details?id=com.coinomi.wallet

iOS wallets:
- Coinomi Wallet: https://itunes.apple.com/us/app/coinomi-wallet/id1333588809.
Paper wallets:
- https://paper.btcz.rocks

Web-based wallets:
- https://www.mybitcoinzwallet.com.

Use Delta to manage your crypto portfolio (BTCZ supported):
- Android:  https://play.google.com/store/apps/details?id=io.getdelta.android
- IOS: https://itunes.apple.com/us/app/apple-store/id1288676542.