Free noteworthy iPhoneography apps today

Pocket Monet (down from 0.69 to FREE)
From the creator of another excellent retro app Lumiere.

Mirror-rorriM (down from 0.69 to FREE)
To mirror half part of your photo.

Dermandar Panorama (down from 1.49 to FREE)
One of the very popular panorama photo capture apps is now free for a limited time. So, get it fast if you like taking panoramic photographs on your iPhone.

iPhoneography apps by features

Over the last few months, I have accumulated hundreds of iPhone apps for photography. And honestly, it is often confusing to remember which app has which particular features. Every time I have to edit a photograph, I am struggling to determine which is the best app to do the job. And also most of them offer the same features in a slightly different way to each other. So, now I am starting to build a catalog of features that I normally want for my photo editing and list down the corresponding apps that support them. This is just a nascent piece of work at the moment, so keep coming back to see regular updates on the page.

• Capturing Photos
Below is a list of apps that I prefer to use depending on the type of photo I am planning to click.
• Normal mode
Native camera app
Camera+
King Camera
• Retro
Lumiere
Retro Camera Plus
• Monochrome
1. Streetmate
2. B&W Camera
• HDR
1. Pro HDR
2. HDR Fusion
• Panoramas
1. Autostitch Panorama
2. DerManDar Panorama
3. Photosynth
• Shutter Control
1. SlowShutter Cam
• Stealth
1. nofinder
• Quick
1. QuickPix
2. BurstMode
• Crop an image
1. Camera+
This app is my first choice when I have the need to crop an image. It offers cropping in various dimensions like square golden ratio, 4:3,16:9, and freeform. 
2. Squaready
3. Iris Photo Suite
4. Photoforge2
5. PS Express
6. FX Photo Studio
• Increase/Decrease Sharpness
1. PS Express
2. Iris Photo Suite
3. Snapseed
• Adjust Brightness/Contrast
1. Snapseed (allows selective adjustment)
2. PS Express
3. Iris Photo Suite
• Increase/Decrease Ambiance
1. Snapseed
• Change White Balance
1. Snapseed
• Increase/Decrease Saturation
1. Snapseed
2. PS Express
3. Iris Photo Suite
• Convert into a monochrome
1. Monochromia
2. Noir Photo
3. Snapseed
4. Camera+
5. FX Photo Studio
• Selective Colouring
1. iQuikColor Splash (allows selecting up to 4 colors at a time)
2. Iris Photo Suite
3. Color Splash
• Convert into HDR
1. Simply HDR
2. Dynamic Light
3. Photo Toaster
4. Camera+
• Adding Depth of Field
1. iQuikDOF
2. Big Lens
• Convert into an Artistic image

1. ToonPaint
2. MobileMonet
3. AutoPainter
4. Autopainter II
5. Paint It! Now
6. Art Camera
7. Artographo
8. Sketch Me!