qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.
OwnTracks - Cross-platform location sharing