An image browser, converter and editor that supports all major graphic formats including BMP, JPEG, JPEG 2000, GIF, PNG, PCX, TIFF, WMF, ICO, TGA and camera raw files. It has a nice array of features such as image viewing, management, comparison, red-eye removal, emailing, resizing, cropping, color adjustments, musical slideshow and much more.
http://www.faststone.org/download.htm
Freeware, but not OpenSource.
+1
I've contacted the publisher for permission.
Sometimes, the impossible can become possible, if you're awesome!
Once in January of 2011, and again, concerning another app, in December 2011, and they never emailed me back.
One of my favorites that I often use is FastStone Photo Resizer. They have a portable version. Now at version 3.1
http://www.faststone.org/FSResizerDownload.htm
I should have mentioned that I am already using this in Portable Apps!