Universal:

Tweetgrid by Firehose Media ($0.99, 3.7 MB): Tweetgrid for iOS allows you to track tweets by using a keyword. All you have to do is type in a keyword relevant to what you want to track, for example “Olympics” and the app will produce a grid filled with people tweeting live about the event. You can even view profiles of people with this app.

Guitar Chord Pro by Hopefully Useful Software ($4.99, 44.5 MB): Write amazing songs on your iDevice with Guitar Chord Pro. Even if you are a beginner, this app will let you create whatever comes into your head and then show you how to play it. You can sample the song that you create as well. The app can also show you chord structures and allows you to experiment with them as you wish.

iPhone:

45sound by 45sound (Free, 3.1 MB): The 45sound app allows you to film live concerts and create music videos for fans around the world to watch. You can record with multiple angles, view current live shows, and share content on Facebook and Twitter.

BUZZcard by BUZZcard (Free, 2.8 MB): BUZZcard allows you to produce branded videos quickly. The app includes several overlays that you can include in your videos. It allows you to place a logo and text at the bottom to make your videos look professional.

iPad:

Comicorder HD – Fool Your Friends App by Shiningworks Co. ($0.99, 12.7 MB): Comicorder HD allows you to transform your world into a live action comic. The app features three different comic book inspired effects. You can also pause your recording to change scenes. There are also voice effects that you can add to the videos. The app includes the ability to save to the camera roll and Wi-Fi sync.

Podium Pro by Magoozle LLC ($2.99, 4.8 MB): Prepare your speeches effectively with Podium Pro for the iPad. The app allows you to record your voice for your speeches in a clutter-free user interface. You can also type your speeches and color code areas. The app also lets you backup your files to Dropbox.