Überthumb
This is the program I use to make thumbnails on my website. Couple of people have asked what I use, so here it is. I just added all the command-line options and stuff today, figured it’d be a good idea.
Versions
Perl
A few things are required:
Yes, the perl version of UberThumb does work on Windows.
Python
I did at some point write a Python version too. Much simpler, all it does is thumbnail your images.
mono/.NET
And there’s a version I built at one point in 2005 using C# with mono.
get it here. Also, you can get the source.