Copay is an open-source secure wallet for keeping BTC. The wallet features HD and multi-signature solutions for easy fund recovery.
This is one of the first bitcoin wallets that started supporting full Bitcoin Payment Protocol – the system will monitor that the payment is directed to the right place when sending money to Protocol-enabled destination.
The wallet is available for IOS, Android, Windows, Mac, Linux. The service has multi-language support for better users’ experience.