BitSpirit is a powerful and easy-to-use BitTorrent client which provides not only full BitTorrent protocol implementation but also many personalized features.
It supports simultaneous downloads, download queue, UPNP port-maping, NAT traversal (UDP transport), select downloads from multiple files torrent package, disk cache, chatting with other peers, torrent market,ip-filter, etc.

http://www.167bt.com/en/