Hi,all

I'm looking for a web-based file sharing system. I have these
requirements:

1. Users through browsers to access this system. Upload and download
files in a easy and friedly way.
2. Need password to enter.
3. When users upload a file, he can add descriptions to it, like
title, author, keywords, tags, etc.
4. There is a powerful search engine in the system. Users can search
files though descriptions.
5. Simple and fast.
6. Free or open-source. Can install it on local server.
7. Multi-languages interface support. UTF-8 support.

I think there are some php-based systems have these features. Please
give me some suggestions.
Thanks.

Long