The 20 best programs for file sharing (P2P - peer to peer)

1) Bittorrent :
This is one of best, fastest, safe and widely used p2p program. Performance of BitTorrent is way better then any other available P2P programs.
Supported Operating System: Windows, Linux, Mac
Download Bittorrent Client

2) Limeware:
LimeWire is clean, safe, virus and malware free p2p software.it has build in media player with optimized search result.supportes download from multiple hosts.
Supported Operating System: Windows, Linux, Mac
Download Limeware Client

3) Shareaza:
This was one of early p2p program when p2p was still new concept. It supports wide variety of networks like Gnutella, Gnutella2, EDonkey Network, BitTorrent, FTP and HTTP network protocols and which can handle magnet links, ed2k links, Piolet links, and the now deprecated Gnutella links.
Shareza has billions of users and uncountable numbers of files shared across shareaza network
Supported Operating System: Windows XP, Vista
Download Shareaza Client

4) Kazaa:
Like Shareaza, Kaaza was one of best and most popular p2p during early days of p2p evolution. but in past few year due to many issues like virus infected files, lawsuite, spywares, Kazaa has lost its popularity.
However kazaa has been continually trying to make Kazaa network virus and spyware free with many new features like built in virus scanner, infected file blocking made available in latest Kazaa Client to protect users.
Kazaa Lite is one of best client of Kazaa P2P network for file sharing.
Supported Operating System: Windows XP, Vista
Download Kazaa Lite

5) iMesh:
iMesh another popular and spyware, adware free p2p file sharing with application multi language support. iMesh claims to have over 15 million FREE songs & videos Over 2 million original high quality songs licensed from the record labels.
Personally I liked iMesh for downloading music and videos but haven’t found it good for downloading any freeware software or application.
Supported Operating System: Windows XP, Vista
Download iMesh Client for Windows

6) Bearshare Lite:
Bearshare is pretty good p2p file sharing program with having pretty good user base and millions of files shared on Bearshare also supports for Multilanguage.
Bearshare is good for downloading music and mp3 files
Supported Operating System: Windows XP, Vista
Download BearShare Client for Windows

7) eMule:
eMule is one of the biggest and most reliable peer-to-peer file sharing clients around the world thanks to its open source support and based on edonkey2000 client.
eMule has Multilanguage support with ability to connect to multiple servers and intelligent file corruption detection system to help you in getting genuine files. eMule is free from spyware, adware and its completely free.
eMule is also available in portable form to run from your USB derive
Supported Operating System: Windows XP, Vista
Download eMule Client

8 ) KCeasy:
KCeasy is client based on giFT peer to peer file sharing protocol. This protocol improves the overall usability of peer to peer network, ability to downloads single file from multiple peers simultaneously.KCeasy supports multiple networks for file sharing.
Supported Operating System: Windows XP, Vista
Download KCeasy

9) Ares Galaxy:
Ares is one of my favorite p2p program and I have been using it from last 4 years, ares network is not that much big as compared to other p2p but its completely free from viruses, spywares and adwares.
I haven’t got any infected files or corrupted installer. Ares List is used more then normal Ares client because of its low size, speed and performance.
Supported Operating system: Windows XP, Vista
Download Ares for Windows

10) Soulseek:
Soluseek central server type of P2P file sharing application. Soluseek is good old p2p file sharing program best of sharing music files. i haven’t tried soluseek ever but have heard that soluseek is best of music, audio, Mp3 files download.
Supported Operating system: Windows XP, Vista
Download Souleseek Client

11) WinMX
WinMX one of pretty old peer to peer file sharing program has suffered due to lowsuite and its official website and server is now offline form 2005 although WinMX program is still operating successfully.
WinMX network has limited number of Viruses and also it has restriction of maximum file size can be shared is 2 GB only.WinMX is mojouly used for audio and video file sharing but you can use it for sharing any types of files.
Supported Operating system: Windows XP
Download WinMX

12) Piolet:
Piolet is the 3rd generation peer-to-peer file sharing client. This is considerably new p2p file sharing application/Website and it has started gaining popularity among P2P users.
Free version of piolet shows ads and has no search functionality. i really doubt whether this can become good P2P file sharing program.
Supported Operating System: Windows XP
Download Free Piolet client

13) Gnutella:
Gnutella is file sharing network which is supported by several p2p clients like LimeWire, BearShare, Shareaza etc.
Gnutella has strong user base with less number of infected files present in file sharing network.
Supported Operating System: Windows, Linux, Mac

14) Overnet:
Overnet is distributed file sharing program which is based on its own network Overnet has more then millions of users with some interesting features like File corruption detection, decentralized, fast search and downloading of files.
Supported Operating System: Windows Linux, Mac
Download Overnet client

15) Azureus now called as Vuze
Azureus is best torrent client with built in search functionality as well as peer to peer torrent sharing. Veze has best bandwidth management for faster file transfer and downloading
Supported Operating System: Windows Linux, Mac
Download Vuze client

16) FrostWire:
Frostwire is like Vuze is another most popular bittorrent client as well as p2p file sharing client which supports Gnutella, Gnutella2, EDonkey Network. it’s completely free from virus and spyware with iTunes integration.
Supported Operating System: Windows, Linux, Mac
Download FrostWire Client

17) uTorrent :
uTorrent is lightweight efficient bittorrent client with lot many features like RSS downloader, Multiple simultaneous downloads downloading, Bandwidth configuration and IPv6 support.
Supported Operating System: Windows XP, Vista, 98, NT
Download uTorrent Client

18) Morpheus:
Morpheus is free p2p file sharing program with many features like search, easy user interface, No spyware, Popups or ads. Latest version of Morpheus also supports P2P Streaming media for video and audio.
Supported Operating System: Window Xp/Vista
Download Morpheus Client

19) ANts:
ANts P2P realizes a third generation P2P net. This is only one of kind of peer to peer file sharing application which encrypts every thing. It protects your privacy while you are connected and makes you not trackable, hiding your identity (ip) and crypting everything you are sending/receiving from others.
ANts is written Java hence it’s supports all types of operating system.Ants is still in beta and not many users are using it
Download ANts peer 2 peer file sharing client

20) Acquisition:
Acquisition is relatively new and paid type of p2p file sharing programe. Acquisition uses Gnutella network for peer-to-peer file sharing and BitTorrent client .It is based on LimeWire.
This is one of dedicated P2P software which runes only on Mac OS X.
Download Acquisition client.

If know any other free peer to peer (P2P) file sharing Application/Program then please post in below comment.