Copay

Copay is an open-source, multiplatform, multisignature, secure bitcoin wallet platform for both individuals and companies.
Main features:
- Multiple wallet creation and management in-app.

- Intuitive, multisignature security for personal or shared wallets.
- Easy spending proposal flow for shared wallets and group payments.
- BIP32 Hierarchical deterministic (HD) address generation and wallet backups.
- Device-based security: all private keys are stored locally, not in the cloud.