MammothCopy is an easy to use, Java based tool designed to help you copy big or many files from one computer on the Internet, directly to another. MammothCopy is a file copying tool to help you with your work. This could also be possible with tools like WinSCP and a SSH server, but those are too complex for normal users. MammothCopy is geared towards parents wanting to send photos to their kids, professionals that want to transfer huge files.

1. Easy-to-use; this means creating a simple user interface and a decent installer (or something that works out-of-the-box like PuTTy).
2. Works behind a router/firewall; this is the hard part. The app will have to support something like UPnP, or it could use a third party for the communication. I thought about IRC, MSN, or any other protocol that can help here. It should be freely available to minimise any setup-hassle and, of course, costs.
3. Works on all major OSs; Linux, Windows, Mac OSX, etc.
4. No size limit. Ever. The only limit should be the receiving end's free hard disk space.

MammothCopy Features:
1. single-window user interface,
2. MD5 integrity checking,
3. resume support,
4. UPnP support to ‘punch holes' in modern routers.

Requirements:
* Java

The license of this software is Freeware, you can free download and free use this file sharing software.