Anfy Mosaic by
Fabio Ciucci
Free With Limitation
Has cool transitions between images

Anfy Fade by
Fabio Ciucci
Free With Limitation
about the same as above

Transliteration by
Per Dahlberg
Freeware
Variety of effects

TinySlideShow by
One Wolf Webart
Freeware
The name is just backwards, a really great applet.

Photo Album II by
A&A Butterfield
Freeware
Photo album

Photo Album by
Jason Connelly
Freeware
dito...

Lithic SlideShow by
Lithic Software
Free For Non-Commercial use.
fades two images in a continous loop

Image Gallery by
?
Freeware
a good slideshow applet

Dynamic Link by
luminous-chao
Freeware
self-service slideshow

Directory by
?
Freeware
What? another slideshow applet? wow!

CodeBrain Slider by
CodeBrain
Freeware
This one really kicks butt...

BookFlip by
Fabio Ciucci
Free with limitation
another good slideshow, this one really flips the pages.

Fading Images by
Black Lab Design
Free With Limitation
Fades images between each other.

Line Trans by
Black Lab Design
Free With Limitation
rolls down the image.

Curtain by
Black Lab Design
Free With Limitation
The famous curtain effect

Blocks by
Black Lab Design
Free With Limitation
Transitions between images by using a "block" effect

Pictures & Text Slideshow by
Black Lab Design
Free With Limitation
A really professional looking java applet

SlideShow by
Eric Harshbarger
Freeware
Allows a web user to easily browser through multiple pictures