Amazon's 40-free-apps bundle (worth $220) "Until December 26" - A few choice ones noted. Updated 12/24-25 - Added UK and Canada's pages

Amazon's offering a 40-Apps bundle: Apps that cost (total $220) but which are free through Dec. 26, 2014
  Though it's called "Free App of the Day Bundle" it's apparently free until the day after Christmas, which makes more sense.  I've edited the title.  But they say "until" rather than "through" so note that wording.

The Muscular System Manual app shown here might help with physiology classes, but the main reason I used this app's image as the lead is that the normal cost of this app is set for $64 but it's free for the next couple of days.

  I had not looked at most of the 40 apps to see what prices were but was curious about this educational one.

  WELL, they added, on the bundle-listing page, after I typed that, the prices for each app -- very helpful.


  For UK and Canada - (specific items shown for U.S. are also available on UK and Canada's bundle pages)
  The 40 free app of day bundle page in the UK
  The 40 free app of day bundle page in Canada




Oxford Advanced Learner's Dictionary, 8th edition
  Normally $30.99.


Others that jumped out at me as possibly useful as well as fun
are shown below.


OTHER free apps until Dec 26 - 38 more, but a couple of noteworthy ones
Photo Transfer app - nornally $1.99.   From the product description:

  Get Your Transfer
Photo Transfer App allows you to easily transfer photos and videos from your Android device to your computer as well as exchange photos from and to another Android device, iPhone, or iPad using your Wi-Fi network.

  Androids and Apples
Upload multiple photos from your computer to your device. Transfer photos and videos from one Android device to another over Wi-Fi; no cables are necessary. Transfer photos from your Android device to an iPhone or iPad and vice versa.

Please note: to transfer photos from to an Android device to an iPhone/iPhone, both devices must have Photo Transfer App installed. Access to a Wi-Fi network is required for this application to work. Some public Wi-Fi networks, such as hotels or public spaces, may be configured to block communication between devices.

iReal Pro - Music Book & Play Along - normally $12.99
  This was "~One of Time Magazine's 50 Best Inventions of 2010~"

  Included in the product-images set is a video that shows you how to use it.
  I was impressed that not only can you choose the key of any song but you can also choose the type of rhythm to use when playing along with the piece.  From the description:

  Practice makes perfect. iReal Pro offers an easy-to-use tool to help musicians of all levels master their art. It simulates a real-sounding band that can accompany you as you practice. The app also lets you create and collect chord charts of your favorite songs for reference.

  “It’s the perfect technology for a practicing musician: high-quality digital audio, mixable, transposable into any key and completely mobile. Now every aspiring musician has a backup band in their pocket.” – Tim Westergren, Pandora Founder

• It's a Book:
Create, edit, print, share and collect chord charts of your favorite songs for reference while practicing or performing.

• It's a Band:
Practice with a realistic sounding piano (or guitar), bass and drum accompaniments for any downloaded or user-created chord chart.

FEATURES:
Have a virtual band accompany you as you practice
• Choose from 35 different accompaniment styles. (More available with In-App purchase)
• 15 Jazz Styles: Afro 12/8, Ballad Even, Ballad Swing, Bossa Nova, Double Time Swing, Even 8ths, Gypsy Jazz, Latin, Latin/Swing, Long Notes, Medium Swing, Medium Up Swing, Slow Swing, Swing Two/Four, Up Tempo Swing
• 8 Latin Styles: Argentina-Tango, Brazil-Bossa Acoustic, Brazil-Bossa Electric, Brazil-Samba, Cuba-Bolero, Cuba-Cha Cha Cha, Cuba-Son Montuno 2-3, Cuba-Son Montuno 3-2
• 12 Pop Styles: 12/8 Rock, Bluegrass, Country, Disco, Funk, Reggae, RnB, Rock, Shuffle, Slow Rock, Smooth, Soul
• Personalize each style with a variety of sounds including piano, fender rhodes, acoustic and electric guitars, acoustic and electric basses, drums, vibraphone, organ, and more

Play, edit, and import any songs you want
• 1000s of songs can be imported from the forums in a few simple steps
• Edit existing songs or create your own with the Editor
• The Player will play any song that you edit or create
• Create multiple editable playlists
. . . View the rest of this at the product page

Also included are Root Explorer and Plex (the latter for those with Plex servers).


Also, the regular SINGLE free app of the day
  How the Grinch Stole Christmas - normally $4.99.


This Christmas bundle is definitely worth a look, and, again, they're available now through Dec. 26.

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