MicroObservatory
• Optimize an image's brightness/contrast automatically, by either linear or logarithmic scaling. • Colorize images using several false color tables. • Invert an image's color table. • Increase image contrast and detail using "sharpen" filter. • Reduce the noise in an image. • Manipulate full screen magnification. • Show image information for individual pixels by cursor placement.
http://mo-www.harvard.edu/MicroObservatoryImage/ - Details

Observation Manager
Observation Manager is a free and open logbook for (amateur-) astronomical observations. It's written in pure Java and runs on every plattform supporting Java 1.4 or higher. All logbook entries made in Observation Manager are stored in the free and open COMAST XML Schema.
http://observation.sourceforge.net/en/ - Details

Little Windows Helpers
Yes, it is possible to write small Windows programs - but who cares? If you do, have a look at these programs written in PureBasic. They do not come with an installation program, and they do not make any entries in the Windows Registry. Just unzip the files to a program folder, and make a shortcut.
http://home.mnet-online.de/horst.muc/win.htm - Details

Amateur Astronomy
1369 manually selected sites about Amateur Astronomy
http://www.cbel.com/amateur_astronomy/ - Details

Gary Kronk's Comet Page

http://cometography.com/ - Details