eMule 0.50a -oldest client to the network

eMule provides easy file sharing capabilities in the widely popular network shared resources eDonkey2000. The network operates on the principle of allocation of resources for public access. Each user gives access to a number of files that I want to share with the community.  

qBittorrent - a multi-platform client Peer 2 Peer network BitTorrent.

  The program features a user-friendly interface includes a search function on popular sites with collections of torrent-files, supports all popular technologies and expand the protocol supports remote management via web interface includes an advanced task management functions, has a special wizard torrent-files can monitor traffic and more.

An important advantage of qBittorrent to some popular BitTorrent-clients (among them, and uTorrent) is the support of the operating system GNU / Linux, which is absent in most other clients. 

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Vuze 4.9.0 - p2p torrent client

Vuze - it is a rich client BitTorrent P2P-networks with a lovely and beautifully designed interface and supports all necessary functions. Advanced users will enjoy the support of all popular torrent-sphere technology. Including just needed: DHT, UPnP, uTP, IPv6, magnet-links, the anonymous exchange protocols I2P and Tor, and more. Newcomers will enjoy the same advanced features such as a powerful search engine for a number of major torrent trackers (with the option to add your own), built-in player and an automatic converter of video formats for different devices. By cons include some confusion Vuze, when looking at third-party resources, but the drawback of the program as it would not have considered.