SimpleViewer is a free flash-based photo gallery (duh) made by Airtight Interactive, that displays images you’ve uploaded in a specific directory.

From their website:

SimpleViewer is a free, customizable Flash image viewing application.

Features:

* Intelligent image pre-loading.
* Intuitive image navigation
* Lightweight (17k).
* Customizable interface – Set text color, frame color and width, navigation position.
* Resizable interface – Interface scales to fit browser window.
* Cross platform – Windows/Macintosh/Linux (requires Flash 7 or higher).
* Flash 7 detection. Users without Flash 7 are messaged to upgrade Flash.
* International font support.
* Keyboard Navigation (Cursor keys, Home, End, Page Up/Down)
* Mousewheel navigation
* Optionally right-click to open image in a new window.
* Free!

Also check out PostcardViewer and AutoViewer.

An alternative to Airtight is FIG: Flash Image Gallery.

FIG includes a somewhat robust administration panel and does not require any particular server-side language. You simply add photos and albums to your catalog through FIG’s easy to use admin back-end.

From FIG.com:

The FIG is a gallery application that can be used by anyone to display multiple galleries of photos, artwork, or other pictures with descriptions. It requires no server-side language and will run on any web host. It is idealy suited for artists with online galleries, but can be used by anyone.

* Simple, intuitive interface and design.
* Works on any webhost without the need of a server-side language such as PHP, ASP, or Coldfusion.
* No need to know Flash. Don’t let the name fool you. Flash is not needed. It was only used to provide the interface.
* Supports multiple galleries and simple image descriptions.
* The color styles of the gallery can be changed to match your existing site. The borders, background, and navigation colors can all be changed.
* Supports up to 224 images in each gallery.
* When there is only one gallery, the interface changes. The gallery name is displayed at the top, the home button is removed, and the thumbnails load immediately.
* It’s FREE.