I have several, most of which are of the "file management" type.
First-off there is Exiv2. I finally settled on a file-renaming pattern for all my images, which (in its most basic way) is the EXIF date/time of the shot followed by the model of the camera. An example is 20050823_152456_d50. Combined with some MS-DOS commands I put in a BAT file, Exiv2 does this automatically very quickly.
But there are other variations, and also when I owned the D50 it was known for putting the ISO information in the "maker" fields rather than the "universal" area. Exiv2 copies/pastes that information into the "universal" area, and handles the other variations--i.e., I put "
raw" as a suffix in the NEF files, and put "nbj" (Nef + Basic Jpeg) as a suffix in JPEGs shot in RAW+JPEG mode.
http://www.exiv2.org/
Then there is Explorer XP, a file manager that has a batch renamer built-in, so I can fine-tune any renames, or undo mistakes more easily. It also makes it easy to assign "speed-dials" to common paths (so I can browse to C:\Pictures\CurrentCameras\NikonD40 in 1 click) and drag-drop from one path to the other in the same window.
http://www.explorerxp.com/
Then there is Infranview, you've heard of that one I'm sure. Great batch renamer and resizer, extremely minimal usage of computer resources. The only problem with it is that verticals don't show up that way, guess it doesn't recognize the "tag" in the JPEG.
http://www.infranview.com
The Nikon D40 hack. What a great work-around. Thanks to this little utility, which edits the EXIF data of the NEF files to read D70 instead of D40 (in order to fool RAW editors not current enough to know about the D40), I don't have to use Capture NX to edit my D40 NEF files. I can use Capture 4.4 without a problem--and, also, if I wish, Photoshop 7 or Nikon Editor (the latter I now almost never use for that purpose) or even the now no-longer updated (but free) Pixmantec RAW Shooter Essentials.
You can read about that D40 hack at my "D40 tips & tricks" website:
http://www.pbase.com/larrytucaz/d40_tips_tricks
Dare I say it--Nikon View, 6.2.5 (I think). Great for browsing JPEGs and marking favorites to copy/resize for the web--by the way, it has a good batch resizer (and renamer, which I never use anymore due to Exiv2) built right-in. Easy to trigger the proper image editor (I have 5 to choose from, Photoshop 7, PSP8, Nikon Editor, Nikon Capture, Infraview) for a given file without having to open that program and browse to the image manually.
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LRH
http://www.pbase.com/larrytucaz
http://larrytxeast.smugmug.com/