With Zultrax P2P you can share any kind of files with millions of users around the world.

WWW File Share Pro is a software that can help you share files with your friends or share files in the office.

Ares is a free open source file sharing program that enables users to share any digital file

Peer2Mail is the first software that lets you store and share files on any web-mail account. If you have a web mail account with large storage space, you can use P2M to store files on it. Web-mail providers such as Gmail (Google Mail), Walla!, Yahoo and more, provide storage space that ranges from 100MB to 3GB.
P2M splits the file you want to share/store zips and encrypts it. P2M then sends the file segments one by one to your account. Once P2M uploaded all file segments, you can download them and use P2M to merge the segments back to the original file.
Peer2Mail is 100% FREE.

Use paranoia as your starting point for creating your own P2P program