iOS/Mac: You probably don't have your phone sitting next to you all the time, so it's easy to miss notifications. Notifyr is an app that pushes your iOS notifications to your Mac to help avoid that issue.
Notifyr works over Bluetooth Low Energy and grabs any notifications from any app you get on your iOS device and displays them on your Mac. You can't actually reply to any of these on your Mac, but you'll at least know they're there. Since it uses Bluetooth LE, you'll need a compatible device( iPhone 4s or later) and a newer Mac. You can snag the iOS app for a few bucks -- you'll also need the free Mac app for it to work.
Notifyr ($5.99) [iTunes App Store]