SoMud is a free cross-platform multi-language P2P client that's not exactly slick, but does return an impressive amount of results.
SoMud allows you to search, download and even play web videos within its interface thanks to its own embedded media player. You can preview media files while they are being downloaded which is handy for avoiding fake or spam files. The download speeds are also impressive although it's obviously dependent on your connection and the number of peers connected.
SoMud is also unusual in that it also allows users to record their desktop or screen activity and share it with other peers. This includes audio and webcam images. In addition, there's a P2P wizard that allows you to create your own torrents and there's also parental control to filter specified keywords and lock specified content.
SoMud doesn't have the simple, slick interface that uTorrent has for example. It's also rather annoying that when you install it, it automatically opens the developer homepage in your browser. Finally, downloads are generally reliable but can take some time to start.
SoMud is a very interesting P2P client with some unusual features and may appeal to those who want a bit more control over their P2P downloading than most other clients allow.