Google isn't the only ones attempting to make more sense of the emails piling up in your inbox. SaneBox is like Gmail's Priority Inbox—but smarter. Its main feature is smart filtering that automatically sorts emails into folders based on how important they are. And on top of surfacing important emails, it comes with features that promise to increase your email productivity, including email reminders, email snoozing, and saving attachments to your cloud storage service. It's like a virtual assistant for your inbox.