Free Software Tools

[Digix]

Lets start a thread of free software tools for photographers.
Here are few I know of:

GIMP, to edit images (http://www.gimp.org/)
IrfanView, to view images (http://www.irfanview.com/)
XnView, to organize images (http://www.xnview.com/)
PhotoME, to edit Exif data (http://www.photome.de/)
BatchPurifier LITE, to delete metadata from jpg (http://www.digitalconfidence.com/downloads.html)

[AlexMonro]

RawTherapee - RAW conversion and image editing (http://www.rawtherapee.com)
Exiftool - Exif data reporting and editing (http://www.sno.phy.queensu.ca/~phil/exiftool/)
UFRaw - RAW conversion (http://ufraw.sourceforge.net/)
Hugin - Panorama stitching (http://hugin.sourceforge.net/)

[pesito]

To build a website and host your photos I can recommend these free website builders (up to 500 MB webspace) that I use myself:
Jimdo (http://www.jimdo.com)
Wix (http://www.wix.com)
Weebly (http://www.weebly.com)

More details about these tools can be found here (http://www.websitetooltester.com/en/website-builder-reviews/).

[Anthony]

Microsoft ICE - panorama ( photo sticher ) and distortion? tool (http://research.microsoft.com/en-us/um/redmond/groups/ivm/ICE/)
Dof master - Depth of field tools (http://www.dofmaster.com/)
Picassa - catalogue and online storage etc. (http://picasa.google.com/)
ImageMagick - image modification (http://www.imagemagick.org/script/index.php) ( Can be used with batch files, bash files, php etc. )
Microsoft pro photo tools - edit meta tags and add geo locations (http://www.microsoft.com/downloads/en/details.aspx?FamilyID=184075d2-40b5-4172-88ae-878f81896d4d)