I am looking for a simple web photo album app with the following attributes:

* Open source
* Linux, Apache, Java or PHP or Python, or .......
* File system/directory hierarchy
* No database needed
* Display thumbnails, click on thumb to see larger picture
* Right click on image and download full size image
* Users add comments and/or ratings
* Clean user interface - no adds
* Don't need a complicated admin page (probably don't need one at all!)
command line OK
* Rotate images (losslessly) for those pics that are sideways
* Drop the pics in a directory and the app does all the work..(generate
thumbs, etc)
* Slide show mode
* Search based on title or tags

If you have used something like this, please let me know. There are so many
out there I am getting swamped by the endless choices!

Thanks!

Mark