What is it?
...it is file sharing
...it is webserver
...it is opensource
...it is free

You can use HFS to send and receive files.
It differs from classic file sharing because it uses web technology, thus is more compatible.
It differs from classic webservers because it is easy and ready out of the box.

Features
- Download and upload
- Virtual file system
- Highly customizable
- HTML template
- Bandwidth control
- Easy/Expert mode
- Log
- Full control over connections
- Accounts
- Dynamic DNS updater