Fox_files_stats is a project mainly written in PHP, it's free.
A Textpattern plugin that prints out statistics about available and downloaded files.
This plugin allows you to print out some statistics about the files you are hosting with textpattern:
You can also filter your results by specifying a category.
Here is the link to the plugin's page: information page It's written in italian, but the plugin's help page (the one that you can read from textpattern I mean) it's in english. This plugin also has his own page on textpattern.org.