Paint.NET is free image and photo editing software for Windows

Paint.NET is free image and photo editing software for computers that run
Windows. It features an intuitive and innovative user interface with
support for layers, unlimited undo, special effects, and a wide variety of
useful and powerful tools. An active and growing online community provides
friendly help, tutorials, and plugins.
It started development as an undergraduate college senior design project
mentored by Microsoft, and is currently being maintained by some of the
alumni that originally worked on it. Originally intended as a free
replacement for the Microsoft Paint software that comes with Windows, it
has grown into a powerful yet simple image and photo editor tool. It has
been compared to other digital photo editing software packages such as
Adobe® Photoshop®, Corel® Paint Shop Pro®, Microsoft Photo Editor, and The
GIMP.

http://paint.net/

System Requirements

Minimum System

* Windows XP (SP2 or newer),
or Windows Vista,
or Windows 7,
or Windows Server
(2003 SP1 or newer)
* .NET Framework 3.5 SP1 (free download
from Microsoft)
* 256 MB of RAM (Recommended: 512 MB or more)
* 1024 x 768 screen resolution
* 200+ MB hard drive space
* 64-bit mode requires a 64-bit CPU and a 64-bit edition of Windows

IrfanView FREEWARE graphic viewer for Windows

IrfanView FREEWARE graphic viewer for Windows

http://www.irfanview.com/

rfanView is a very fast, small, compact and innovative FREEWARE (for
non-commercial use) graphic viewer for Windows 9x, ME, NT, 2000, XP, 2003
, 2008, Vista, Windows 7.

It is trying to be simple for beginners and powerful for professionals.

IrfanView is trying to create new and/or interesting features in its own
way, unlike some other graphic viewers, whose whole "creativity" is based
on feature cloning, stealing of ideas and whole dialogs from ACDSee and/or
IrfanView! (for example: XnView has been stealing/cloning features and
whole dialogs from IrfanView, for 10+ years).

IrfanView was the first Windows graphic viewer WORLDWIDE with Multiple
(animated) GIF support.
One of the first graphic viewers WORLDWIDE with Multipage TIF support.
The first graphic viewer WORLDWIDE with Multiple ICO support.

Some IrfanView features:

* Many supported file formats (click here the list of formats)
* Multi language support
* Thumbnail/preview option
* Paint option - to draw lines, circles, arrows, straighten image etc.
* Toolbar skins option
* Slideshow (save slideshow as EXE/SCR or burn it to CD)
* Show EXIF/IPTC/Comment text in Slideshow/Fullscreen etc.
* Support for Adobe Photoshop Filters
* Fast directory view (moving through directory)
* Batch conversion (with image processing)
* Multipage TIF editing
* File search
* Email option
* Multimedia player
* Print option
* Support for embedded color profiles in JPG/TIF
* Change color depth
* Scan (batch scan) support
* Cut/crop
* IPTC editing
* Effects (Sharpen, Blur, Adobe 8BF, Filter Factory, Filters
Unlimited, etc.)
* Capturing
* Extract icons from EXE/DLL/ICLs
* Lossless JPG rotation
* Unicode support
* Many hotkeys
* Many command line options
* Many PlugIns
* Only one EXE-File, no DLLs, no Shareware messages like "I Agree" or
"Evaluation expired"
* No registry changes without user action/permission!
* and much much more

Introducing Seadragon.com

At Seadragon.com you can share any image on the web as a zoomable photo.
Simply point Seadragon.com at any image you've got on the web, and in no
time flat, you've got a zoomable viewer just like this one. Share the link
on Facebook, Twitter, or through email or IM. Or embed it directly on your
blog, eBay listing or virtually any site. Go ahead, click on the image
below (or use your mousewheel) to zoom in, and drag it to pan around.

Seadragon.com allows you to share virtually any size image on the web,
whether it is a five, ten or two hundred megapixels. Because the viewer
uses the same Deep Zoom image technology available to developers in
Microsoft Silverlight, no matter what size the image is it loads quickly.
The embedded viewer adjusts dynamically to the layout of your page, or can
be customized to a specific size with just a quick change to a script
size, so now any size image fits perfectly on your site. And because
Seadragon.com uses a dual-mode Silverlight & AJAX control, it works on
virtually any browser--automatically using Silverlight to provide a
smoother experience and better performance when available, and defaulting
to a scripted viewer when it is not.

http://seadragon.com/