Minishowcase: The PHP Photo Gallery

minishowcase is a small and simple php/javascript online photo gallery, powered by AJAX that allows you to easily show your images online, without complex databases or coding, allowing to have an up-and-running gallery in a few minutes. Here the demo

Features:

1. New interface
2. Simple galleries
3. Lightbox view
4. Languages
5. Permanent URLs
6. Automatic thumbnails
7. Added viewing features
8. Private galleries
9. Plug-in interface

Requirement
at least php v4.2.0
GD or GD2 extension
FTP account and client.
browser must be JavaScript Enabled
minishowcase is licensed under a Creative Commons Attribution-Share Alike 2.5 License. And was released on Sep. 29, 2007. There's also explanation for configure the theme and intergrate the gallery with another application.

Note: This gallery is not compatible with IE 5.x Mac

PHP DIRECTOR - Your Open Source Video Gallery

I stumbled upon this open source video gallery while looking for php video upload script. But can't find one and found this. If you plan to start your own youtube, you may want to try this.

PHP Director does not allow user to upload video, but it lets user to paste the URL of video clips from youtube. After submit the video to PHP Director, the application will retrieve all the thumbnail available from youtube. And user can start to name it and give some description of the video.