You mean something to send files to your clients(or where they can pick them up? Persaonlly, I would go with a basic web server. Appache or something like that. Don't set any default page, disable directory browsing, and only people with a direct link should have access to the file you provide.
I have better luck with HTML, both with speed and reliability.
I would also give you some FTP servers, but I don't know of any right off...sorry.
Desktop: Athlon 64 3700, 1024M RAM, GF 6200 TC 256M, 2x 80G, 2x DVD-RW
Laptop: Sempron 2800, 512M RAM, Unichrome, 60G, DVD-RW
Macintosh:G4 1.33GHz, 512M RAM, Radeon 9200 32M, 40G, DVD/CDRW
They get me from 0 to 1...