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