LimeWire
LimeWire is the world's fastest P2P file-sharing application for all types of computer files, including music, video, pictures, games, and text documents. Other features include dynamic querying, file previews during download, advanced techniques for locating rare files, and an easy, clean user interface.
BitComet
BitComet is a fast and easy-to-use BitTorrent/HTTP/FTP download client. It is P2P file-sharing freeware and one of the most popular P2P protocols designed for high-speed distribution. BitComet supports simultaneous downloads, DHT networks (trackerless), a download queue, selected downloads in the Torrent package, fast-resume, disk caching, speed limits, auto port mapping, proxies, and IP filtering.
uTorrent
uTorrent is a powerful and efficient BitTorrent client for Windows. Most of the features present in other BitTorrent clients are present in uTorrent, including bandwidth prioritization, scheduling, RSS auto-downloading, and Mainline DHT. Additionally, uTorrent supports the protocol encryption joint specification and peer exchange. Unlike many torrent clients, it does not hog valuable system resources--typically using less than 6MB of memory, allowing you to use the computer as if it weren't there at all.
BitTorrent
BitTorrent's software client allows you to quickly download high-quality digital content such as video, music, and games. Available in over 20 languages, it leverages our community of over 70 million users to securely deliver files to your PC faster than anything else out there.
Features include detailed graphs and stats on the health of digital media files provide you a safer, more controlled downloading experience, local peer discovery and automatic port mapping increase file transfer speed without the need to reconfigure routers or other hardware, and dynamic bandwidth management allows you to download content without disrupting Web browsing, e-mail, or other applications.
eMule
eMule is one of the biggest and most reliable peer-to-peer file sharing clients around the world. Thanks to it's open source policy many developers are able to contribute to the project, making the network more efficient with each release. eMule is a filesharing client which is based on the eDonkey2000 network, but offers more features than the standard eDonkey client.BitLord
BitLord is a p2p file-sharing program fully compatible with .torrent files, which is one of the most popular p2p protocol designed for high-speed distribution of 100MB or GB-sized files. BitLord supports simultaneous downloads, download queue, selected downloads in torrent package, fast-resume, chatting, disk cache, speed limits, port mapping, proxy, and IP-filter. Version 1.1 adds integrated Web browser.
p2p softwares have made it possible to download data in GBs. It appears to be efficient and more reliable source of downloading. Ofcourse there are disadvantages of p2p softwares as well such as malwares and viruses in files, no central authority to guarantee quality of file but still we love it.
Source: Respective owners of the softwares mentioned. The order of the list is defined as the most downloaded softwares at download.com from LimeWire the hoghest downloaded to BitlLord the lowest one.