If you own a iPhone, then you are probably taking a lot of photos.
While iPhone does have its built-in features for managing and editing
photos, a lot of us like to use apps. Here is a list of free photo
editing and management apps for your iPhone.
#1. Pixlr-o-matic

This app lets you transform your photos by applying cool retro effects to them. Pixlr-o-matic
offers a wealth of filters and lighting options in a strip along the
bottom as well as a selection of borders. You can either take photos
using your device’s camera, or apply the effects to an existing image.
Link: Pixl-o-matic
#2. Photosynth - Capture your world in 3D

Microsoft’s Photosynth app for iPhone
(oddly, it’s not available for Windows Phone 7) lets you create
seamless, 360-degree panoramas from multiple photos. Just press ‘start’
and rotate slowly on the spot to capture and stitch together a series of
shots. You can add your panoramas to Bing Maps and explore other users’
efforts.
Link: Photosynth
#3. Flock

Flock groups together your photos with those of your
friends and family to create a shared online album of a particular
event. It scans your photos as you take them, and displays them with
your Facebook friends’ photos taken at the same time or in the same
place, with the same people in them. You can set individual photos to
private if you don’t want to share them.
Link: Flock
#4. Pixengo

With Pixengo, you can add 30-second voice messages and ambient sounds
to your photos to add atmosphere to them and bring them to life. The
app works on new photos, as well as old images saved in your gallery.
You can share your ‘audio photos’ with friends on Twitter, Facebook and
email.
Link: Pixengo
#5. Blippar

Augmented-reality app Blippar uses your phone’s
camera to recognise real-world items such as posters, newspaper adverts
and food products. The app then overlays the object with games, videos
and web links. Cadbury is currently offering Blippar content via the
packaging of its chocolate bars.
Link: Blippar
#6. TouchRetouch Free

Forget messing around with fiddly editing tools; TouchRetouch Free
lets you remove unwanted elements from photos using your finger. Just
select the item you want to erase and press Go. Usefully, the app
includes unlimited Undo actions in case you’ve eradicated something
important.
Link: TouchRetouch Free
#7. PicArts Photo Studio

Pic Arts Photo Studio lets you edit individual or
multiple photos. You can add stickers, lighting effects and frames, and
rotate, crop and resize your photos. Our favourite tool is Color Splash,
which turns your picture black and white, then restores colour only to
certain parts.
Link: Photo Studio
#8. Instagram

This addictive photo-sharing app, bought by facebook for $1billion,
lets you add filter effects and tilt-shift blurs and borders to create
unique images from your phone’s camera. You can share the images on
Facebook, Twitter, Tumblr, Foursquare or by email, and they will also
appear on your Instagram account’s news feed, where they can be rated and commented upon.
Link: Instagram
#9. Web Albums – A Picasa viewer

This app let’s sync your iPhone or iPad photos with your picasa account. Using Web albums app you can view, upload and manage your picasa photos.
Link: Web albums
#10. Dabble

Dabble turns holiday snaps into postcards that can
be pinned via the app to the place the photo was taken, and shared
on Facebook by email and by text. You can add messages to your
postcards and tag people in them, and see other people’s postcards when
you check into a location on the app. When you arrive somewhere, the app
will alert you if there is a Dabble photo saved for that location.
Link: Dabble
#11. Snapseed (Bonus)
Snapseed is also a very popular photo app on iPhone. It is popularly
known as the best photo editing app on the iOS ecosystem. Though in the
past it was a paid app, it is now free for iPhone users after Google
bought it.
Link: Review of Snapseed
Hopefully you have all the app you need in this list. Do let us know of any other ones we have missed in your comments.