Online Image Resizer
OIR is the most comprehensive free image resizer tool online. Not only you can resize images and photos, but also make a basic image processing such as converting your image to “gray scale” (making it black and white), rotating or mirroring image, controlling image quality and finally paste a text over image (creating a copyright watermarks or simply pasting a date or any other text).
Online Resize Utility
This online resize utility is developed for digital camera owners, webmasters, people travelling who quickly want to resize a digital image for email or publishing on a web site. No need to open a photo editor to do this! It works together with photo2mobile so you can put your photo on your mobile phone. No cable or software required!
Looks like a very useful site.
Best Open-source Graphic Editors
Filed under: Free Photo Editing Tools, Free Software, Free Webmaster Tools
Here is a collection of best open-source graphic editor programs which you can use for web-designing. You can use all these without any problem as they are open source. As I write this site has 40 open-source graphic programs.
You can find links to other such programs on the site.
The site is worth exploring if you are interested in web-design and graphics.