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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Kindle Fire Tips: PicShop photo editor for Kindle Fire and Android is Free App of the Day, Tues, Aug 13, 2013. Filters, frames, overlays (and Caveats)

In reply to the blog entry about the HD Camera app (which is about how to use the front-facing camera to take photos of yourself or whatever is behind you), commenter David Silva once alerted us to another camera app he recommended for Kindle Fire HD owners.

  It's the PicShop Lite Photo Editor, by esDot Development Studio, and this "Lite" version is always free.

1.  For the always-free version, there are currently 337 customer reviews, with an average rating of 4.1 stars.

TODAY, the paid version of PicShop - Photo Editor (usually $4.99) is free, for just today -- August 13, 2013.

Product Features

(for both versions)
Full Editing Suite
Filters and Effects
Frames and Overlays
Sketch Mode w/ 8 different brushes
Meme Maker
Speech Bubbles
Text w/ Adjustable Font
Fun Stickers (Hats, Moustaches, Love etc)
Social Integration (Facebook, Twitter, Email)
Customize app with your own personal theme

The "Editing Suite" includes:
Color / Saturation; Brightness / Contrast; Sharpen / Blur; Tilt Shift
Depth of Field; Blemish Remover; RedEye Remover; Auto-Correction;
Crop; Rotate; Flip


2.   The usually $4.99 paid version also has an average 4-star rating, with 1,053 customer reviews currently showing on the actual customer-reviews page. There are a large number of dissatisfied users and a seeming lack of customer support for too many (and no identifiable vendor responses seen) but also over 600+ 5-star reviews.
  Image-quality-conscious photobugs should read the CAVEATS (in red) below also.

The app maker doesn't mention what the differences are, between free and paid versions, but one customer said the "full version" was needed to "unlock" something, another customer wishes she "didn't have to buy [the] full version" to get the rest of it, and one person said it seemed to "taunt" you with things available only in the paid version (although if one likes it, $5 is not a huge price and it has a sizeable number of people who chose it over the free one eventually).

*CAVEATS* - A review today pointed out that any image he saved (even if he made no changes) was badly compressed by the SAVE action and was no longer the clear artifact-free image that the original was.

  He doesn't mention what tablet or phone he was using or if he tried it with another device, but the probability is that it's the method of Saving the image (and maybe a setting somewhere to choose the quality of the saved image but I haven't tried the newest version yet).

  Since it's free today, it's probably worth trying to see if this happens to your images.  You would Save (the changes) AS [another filename], giving the saved-changes file a different name.  Never "Save" an original photo or image by overwriting an existing image but save it with a new name or make sure you have a backup copy.

  There are now many reviews from today's downloads, and many users cannot save changed images to their devices, while others are highly enthusiastic about what it does.  It seems to work well with the Kindle Fire but not with some other devices.  What is disturbing is that the appmaker offers this for free today but doesn't respond to problems voiced over the last half year and should be responding today too.

  I'd like to hear what blog readers here experience happening to their test image when saving changes and what device you are using, if people don't mind reporting on that.


The Product Description from the product page:

---

Photo editing on your Android device

"Full-Featured Photo Editor for Android

PicShop - Photo Editor features a beautiful design combined with tons of editing options and dozens of filters. With support for HD images up to 8MP, PicShop is great for serious photographers as well as casual.  Post your perfected photos to Facebook, Twitter or e-mail with a single click.

The UI Layer for PicShop is fully GPU accelerated, which translates into extremely low battery consumption, and a beautifully smooth 60hz interface. This app is a joy to use.

Photo Editing Controls

This photo-editing Suite includes Color/Saturation, Brightness/Contrast, Sharpen/Blur, Tilt Shift, Depth of Field, Blemish Remover, RedEye Remover, Auto-Correction, Crop, Rotate, and Flip."

This editor can of course be used with photos that you transfer to the Kindle Fire HD or to whatever Android device you're using, either via a USB connection to a computer or via the WiFi File Explorer "over the air."

---

Check often: Temporarily-free recently published Kindle books
  Guide to finding Free Kindle books and Sources.  Top 100 free bestsellers.  Liked-books under $1
UK-Only: recently published free books, bestsellers, or £5 Max ones
    Also, UK customers should see the UK store's Top 100 free bestsellers.

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Questions & feedback are welcome in the Comment areas (tho' spam is deleted). Thanks!