One may create or edit a picture directly at a Web page. A picture may be uploaded/downloaded to/from a server in PNG format. Installation assistance.[Commercial/Evaluation] http://izhuk.com/painter/
Allows to process a photo online: crop, resize, rotate, flip. The resulting image can be uploaded to the server in JPEG format. No plug-in is required. [Shareware] http://izhuk.com/imaging/
Plays a sequence of images, as a loop or a one-shot. Also supports playing a soundtrack and sound effects tied to individual frames. [Source included] http://java.sun.com/applets/jdk/1.1/demo/Animator/
Applet that allows the viewing of color or black and white TIFF documents through the Internet. [Commercial, w/ demo version] http://www.acordex.com/vtj/
Java applet which allows viewing of the relationships between saturation, intenstity, hue, and luma. [Source code available] http://r0k.us/graphics/SIHwheel.html
A simple Java applet that lets embed photographic VR in web pages without any plug-ins. It's much like what Apple calls a Quicktime VR "Object Movie". [Open source, GPL] http://www.honeylocust.com/vr/