1. LimeWire is a software tool that enables peer-to-peer file sharing on the Gnutella Network that's about as simple and effective as a Gnutella clone can get while keeping all the power of the Gnutella Network. LimeWire has useful options like the ability to search for specific files types, the ability to have search tabs to keep track of multiple searches, You can search for files of any type including Music, Documents, Programs, Videos and Images.
 
2. iMesh is a search tool that lets you locate and download audio, images, documents, and video files from a growing community of seven million people. The files themselves are located on the computers of other iMesh users who have agreed to share their files, and can be transferred from one desktop to another without a server in between. Downloads are very fast and can be resumed later if a file's owner disconnects from iMesh.
 
3. Bearshare lets you search for, download, and share files with everyone on the global Gnutella peer-to-peer information network.  They have just released version 4.0 which is a big improvement in the interface and ease of use! This program works with MP3, MPEG, AVI, ASF, MOV, JPEG, GIF, and all other file types. It features full documentation (installed with the program), slick graphics, and a user interface that makes searching, downloading, and file sharing easy.

4. Shareaza is a very new, and easy to use file sharing software tool that uses the peer-to-peer Gnutella Network. Mp3 music files download quickly and speeds are quite reliable.  You can search for files of any type including Music, Applications, Videos, Images and more!  It's definitely worth the download to share your files with the Gnutella network.

5. Xolox is becoming one of the more popular music file sharing programs.  One of the best clients out there with extremely fast connections, searches, and downloads for your file sharing pleasure!