MonoTorrent
The repository for MonoTorrent, a bittorrent library for .NET
... disk reads. Auto-throttling if the download rate exceeds the piece verification/disk write rate. IPV4 connections. IPV6 connections. IP address ban lists. Creating torrents from a single file, a folder, or arbitrary files in arbitrary folders. Fast resume data can be saved/restored to avoid hashing the data every time a torrent is started. Incremental piece hashing (reduces disk reads by incrementally hashing each block in a piece as it is received).