Here's the official thread:
First App for the ST-16: Flight Center - Updated 15th November: v1.9
I'll answer briefly though, as I'm the author.
Flight Center is a set of tools for your Typhoon, running on the one thing you're sure to have to hand - your ST-16.
If you're interested in reviewing your flights, watching them on a map or checking statistics, it helps with that.
If you want to design Cable Cam routes on a map before you fly them, it helps you do that.
If you want to download telemetry and FPV videos and stills from the ST-16 without messing around with SD Cards, it helps you do that.
If you want to see where you were on a map at a particular point in a video, or when you took a picture, it helps you do that
If you want to make quick notes to track your flights, photos and videos it helps you do that
There are more features planned, but the aim is to help you get the most out of your flights.