So I'm looking for a file management system which I can host to allow my clients to download their own files from my server. Is there something like this? I want one that allows me to use passwords.
Well... the easiest way to do this is make your IP public (I think it's an ISP matter), and... well... write some PHP. An HTTP-Authorization header. That's how browser FTP access works.
As to CMS, one word (there might be two, actually, but, well... ): Wordpress. Powerful, yet easy to install, and I can already think of how you create tags for each file, increasing its search accuracy, making the posts hidden to the public, close registration, and create an account for each user you want to have access to the files.
Well... the easiest way to do this is make your IP public (I think it's an ISP matter), and... well... write some PHP. An uploading script + an HTTP-Authorization header. That's how browser FTP access works.
I've edited my above post. And you could also use a forum system (phpBB), where you create only a hidden forum, available to those who registered, and have been given special privileges by you. Be creative, there are a lot of options