I remember a Pascal Torrent project a few years ago. It was quite stable but unfortunately it didn't support all the features of latest torrent protocol. It had no DHT support, it had no Peer to Peer seds exchange, no encripted transfers.
As far as I know Pascal Torrent didn't depend on external libraries but it was trying to reimplement whole torrent protocol using Sockets.
In the end I belive that orignal authors abandoned this project.