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http://www.bitfolge.de/snif-en.html - snif = simple and nice index file
I also needed some similar functionality
so I made up some my own script (included some code from snif and
Php_Easy_Download)
U can
download it from here
http://dz0.tinkle.lt/listing/index.php?start_dir=downloads
(diferent methods - direct and anti-leecing)
adn see it's power right here
http://dz0.tinkle.lt/listing
(well, interface is in my native lang, though I put explanations in en in config file)
For anti-leeching You can just use
download_attachment($file) from download.php