BitTorrent is a peer-to-peer file sharing protocol  and a Free Torrent Software used for distributing large amounts of data. BitTorrent has been one of the most common protocols for transferring large files over the last few years.

Miranda IM  is one of the most flexible Free Windows IM Client and messaging  application, designed for the Microsoft Windows operating system. It  is distributed under the General Public License.

The Free Peer-Peer Security Software PeerGuardian is an open source IP address blocker and a Free P2P Virus Protection software, that can prevent access to thousands of sites. It uses multiple, categorized lists and you can choose which type of sites you want to block, including spyware and malware related, advertising related and P2P file sharing [...]

 BitPim is a Python-based application designed specifically to Sync Files on CDMA Phones, as well as many Sanyo Sprint cell phones. You can Synchronize Files Calendars Address Books RingTones Wallpapers on CDMA Cell Phones with Free BiTPIM .

 POPFile is a powerful, cross platform email classification POP and NNTP proxy, that you can use to filter spam efficiently and categorize good mail automatically. You can Automatically Sort Web Emails with Free POPFile.