Off-the-record (instant) messaging

http://www.cypherpunks.ca/otr/
This plugin enables private conversations over IM by providing encryption, authentication, deniability, and perfect forward secrecy, according to the site. Here are some other references:

Wikipedia entry
Sourceforge site
Freshmeat announcement

USAPhotoMaps

http://jdmcox.com/
This guy is a retired airline pilot who has some cool software he’s developed. From the site:
USAPhotoMaps downloads USGS aerial photo and topo map data from Microsoft’s free TerraServer Web site, saves it on your hard drive, and creates maps with GPS accuracy.

Partition Logic – free partition manager

http://partitionlogic.org.uk/
There are a bunch of partition managing applications out there – all charging fees and providing the same level or service. This is free, runs off of a CD or floppy (can probably be ported to a thumb drive (USB)), and boots into Visopsys.
From the site:
Partition Logic is a free hard disk partitioning and data [...]

FavIcons from pictures

http://www.chami.com/html-kit/services/favicon/
The site indicates you can use either static images or animated .GIF files to generate a “Favorite” or “Bookmark” icon. This is an online web application.

Wellstyled’s Color Scheme Generator

http://www.wellstyled.com/tools/colorscheme2/index-en.html
The thing I really like about this web app is that you have the ability to select types of color schemes, such as:

Mono (Degreed shading of same base color)
Contrast (Base color with degreed shade plus opposite color and degreed shade)
Triad (Even three-way split off of base color)
Tetrad (Four-way even distribution from base color)
Analogic (Three-way similar-shade [...]

A List Apart

http://alistapart.com/
From the site:
A List Apart Magazine (ISSN: 1534-0295) explores the design, development, and meaning of web content, with a special focus on web standards and best practices.

Color Blender

http://meyerweb.com/eric/tools/color-blend/
Yes, another color scheme web application. This one is different in that you first pick a high color, then a low color, select how many steps of shades between the two (midpoints) you want to see, hit BLEND, and there you go…
Try it, you’ll see.

Color Schemer Online

http://www.colorschemer.com/online.html
The web application is very useful for visualizing color schemes that go together very well. It has an easy-to-use interface, and can be downloaded to your desktop for those times you are unable to get online.