Rakshasa

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LibTorrent is a BitTorrent library written in C++ for Unix. It is designed to avoid the redundant buffers and data copying that most (all?) other BitTorrent implementations suffer from. The library is single-threaded and the client handles the select loop. An interactive ncurses client is included as an example.

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rTorrent is a console-based BitTorrent client. It aims to be a fully-featured and efficient client with the ability to run in the background using screen. It supports fast-resume and session management.