These source codes are for iOS which has similar functionality like photoshop such as any image filter, cut and resize, blur effect, add text, adjustment and other. Check out these link below for more detail.
PhotoGram Image Editor iOS Template + AdMob/iAd
Pixl – Full Image/Photo Editor App Template
Apply great effects on your photos with Pixl, a full app template with a built-in custom image editor (NO Aviary SDK).
Image Editor App Templates Bundle – AdMob/RevMob
SharePic – Image Sharing Custom Control
Share your pictures and favorite images or save them to Dropbox with a nice flat custom control that you can easily add to your own app project!
PicShape – Frame Image Editor Full App Template
Apply custom frames around your pictures and color them the way you like wth PicShape, a nice Full App Template for iPhone/iPod touch.
iWeather – a beautiful weather client for iOS
iWeather is a beautiful, simple and feature rich weather client for iOS.
PhotoKit
Mixown Mini – iPhone Photo App
Create and solve your own mixed puzzle to get compatible amazing image.
TurnThePhotos
PhotoKit 2
Camera More
iGallery – Online/Local Photo Gallery for iOS
iGallery is a beautiful and easy to implement Photo gallery for the iOS.
PhotoGram Full App Template for iPhone + Admob/iAd
A full App Template with a Built-in custom image editor.
Photo Gallery for iPhone
PhotoShare FX
Photo Share FX is an iPhone component and demo app.
Photo Slideshow (xcode)
Simple Photo Slideshow with a nice dissolve effect between pictures.