Black Friday Tip: Free iPhone & iPad Apps – Battle Nations, Scan To PDF, GyroSynth

Here’s an tip for iPhone and iPad owners good for Black Friday and, in fact, every day of the year. If you follow iOS app tracking sites like AppShopper and 148apps, you know that there are a lot of apps that have their prices reduced or even become free for a period of time. Then, of course, there are apps that are free all the time. Here’s three that are free on this Black Friday.

Battle Nations is a freemium game with in-app purchases with a wide range (99 cents to $49.99). It is an stategic action game produced by Z2Live which also produced “Trade Nations” and “MetalStorms: Online.”

Scan To PDF is normally priced at $3.99. It is free for just today (24 hours). The app can transform a newly taken photo or one from the iPhone’s photo library into a PDF document.

GyroSynth is normally priced at 99 cents and is free for the Thanksgiving holiday. The app lets you create music by physically waving an iPhone around in the air. I reviewed it last year (with an audio example): Mini-Podcast 21: GyroSynth for iPhone 4 – Create Music by Moving an iPhone 4 in the Air.