One of the few Android and IOS based multi-currency wallets that is open-source with a built-in exchange.
An iOS-centric BTC app (also available in Android), offers unique cold storage capabilities.
Dark Wallet BTC
One of the first Chrome-based browser extensions, allows for client-side storage of private keys.
Monero Wallet for Google Chrome
A Chrome extension-only wallet for users of Monero (XMR).
Advanced multisig desktop BTC wallet with API interface, "Secure Bitcoin Storage Made Easy."