Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
eMule - eMule is a free peer-to-peer file sharing application for Microsoft Windows.
Nifty - Manage projects, work, and communications in one place.
BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.
CAMPR - Open source project management tool with 16 modules
LimeWire - LimeWire is a free peer-to-peer file sharing platform that is available to use on Windows, Mac OS and Solaris platforms.