p2p tools 

IMHO, the best bittorrent client around. Uses little resources and is full of features.

Good p2p VOIP service. Need say more?

The most feature filled torrent client out there!

"Open source Windows client for the ED2K and de-centralized Kad networks released under GPL."

Cabos is a rather new file-sharing program that connects to the gnutella (limewire) and acquisition networks. The interface is lightweight, yet it feels fully featured. I get great download speeds with this, plus the interface is one of the best i've found on any p2p app.

best free file sharing application with many community-related features like chat, comments, music rooms.

Daily live football matches and all tools for p2p systems

Warez P2P is now a completely spyware and adware FREE file-sharing program with a great easy-to-use interface. Search and download your favorite music and video files shared by other users on the free peer-to-peer network.

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Another cool p2p software

Good music downloading software.

Fast and bloat free. Adds songs to iTunes automatically, as well as grays out songs that are already in iTunes. Runs on the Gnutella network, but notas slow as LimeWire. Mac OS X only.

Great - free, fast and clean BitTorrent Client. It's lightweight, uses low amount of resources.

Ares is a free open source file sharing program that enables users to share any digital file including images, audio, video, software, documents, etc.

Amazing p2p VPN tool -- works well and works fast! Play games over Hamachi -- and it wont balk.

Sundera enables real time P2P collaboration between multiple Excel users. It distributes and collects data, not files, directly to your spreadsheet from and to multiple spreadsheet sources by secure and easy way.

Combines instant messenger with P2P sharing

JYBE is a plug-in to both Microsoft Internet Explorer and Mozilla Firefox and runs using a central server that can be located either outside or within a corporate firewall. JYBE works off a "session" concept which means that users connect to each other using a common session name. JYBE brings real time collaboration to any web based system without the need for screen or application sharing.

Shareaza is a open-source file sharing system that can harness the power of up to four separate peer-to-peer (P2P) networks, including BitTorrent, Gnutella, EDonkey2000 and Shareaza's native network, Gnutella2 (G2).

Not only that, but Shareaza is completely FREE and won't show any annoying ads or pop-ups. It won't install any unwanted third party programs that can wreak havoc with your computer. No spyware, no registration, no "paid version".

Krawler[x] lets you publish your personal content on the p2p networks and web. Content distributed with modified bit-torrent. Can also create & manage content using various tools with Krawler[x]. Also a p2p Social Network. Mimics IRC. Currently under beta.

InstaColl - an easier way to securely share your Microsoft Office documents in real time.

iTunes integration – quick and easy audio and video exporting to iPods** through iTunes. Firewall to firewall transfers – now supports UDP to UDP transfers giving you access to more files. One-click CD burning – burning your Morpheus files has never been easier. And more...

Gnutella client that works. But only for pr0n :)

Groove.com is argubaly the best office collaboration software -- sucks that it's not free, unlike other p2p software noted here.