Several independent mobile development firms are working together on a promotion they call "App Santa." Until December 26, participating iOS and Mac apps, which include Launch Center Pro, Star Walk, PCalc, Day One, Clear, Tweetbot for Mac, Scanner Pro and Drafts 4, are up to 80 percent off. In some cases, buyers will save as much as five or six dollars.
This is the third year for the App Santa promotion. A complete list of the participating apps can be found at the link below.