Coming from Blackberry, I wish there was. The only notification app I'm aware of is, NoLED. It places color-coded icons on your screen that represent missed calls, emails and texts. It's amazing that Samsung didn't utilize the Led for anything but the camera. Hoping that changes in a future OS update because I really miss it.
Even if Samsung didn't include LED notification, why don't they implement beep notifications of missed calls/sms/whatever? My old Motorola RAZR from back in 2005 beeped every 5 minutes to let me know I missed something.