Here are some applications available on App store. You can get the following Apps for free for a limited time. So go ahead and grab
SoundHound - Normally $7 - Identify songs
Filterstorm Neue - Normally $4 - Powerful all-purpose photo editor
Articles - Normally $1 - Offline Wikipedia client
Scanner Pro by Readdle - Normally $7
Groceries 4 - Normally $1
Map My Fitness+ - Workout Trainer for General Fitness, Running, Cycling, GPS Tracking and Calorie Counter - Normally $3
Chemio - A Student's Chemical Reference - Normally $1
Meeting-Recorder - Normally $2
Decide Now! - Normally $1 - Helps you make decisions
iRewardChart: Reward Tracker Behavior Chore chart for Parents - Normally $4
1 to Call - Everyday, Call your beloved ones - Normally $1
Flowpaper - Normally $1 - Physics-based art
Path on - Swipe to Type - Normally $2 - Type along paths in photos
Splitter Pro - Normally $2 - Combine photos
Rayman Jungle Run - Normally $3
Boom Boat 2 - Normally $1
Micron - Normally $1 - Rhythm puzzler
Cytus - Normally $2 - Music game
Hipster City Cycle - Normally $2 - Pixel art bike game
[Via LifeHacker]