Box - Box offers secure content management and collaboration for individuals, teams and businesses, enabling secure file sharing and access to your files online.
Toshi - A browser for the Ethereum network
Google Drive - Access and sync your files anywhere
MyEtherWallet - MyEtherWallet is a free, open-source, client-side interface.
Dropbox - Online Sync and File Sharing
Exodus.io - All-in-one app to secure, manage and exchange blockchain assets.