Acqlite
Go peer-to-peer with a client that uses the power of LimeWire, Acquisition and Cabos on the Gnutella network — all with open source goodness.
Chicken of the VNC
Display and interact with a remote computer screen as if it were right next to you.
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CloudApp
Free service allows you to share files. Sign up for CloudApp’s service, download the software, and get an icon in your menu bar. You can then can drag files there to be uploaded to a server, where others can download them. A link is automatically placed in your Mac’s clipboard, so you can share it by pasting it into email, for example.
Dropbox
Sync and share your files online. Can also be used for automatic backups with a history going back 30 days. The free version allows two gigabytes of data.
Droplr
Free service allows you to share pictures, documents and other files — by dragging them to a menubar icon. Built-in functionality allows for screenshots and notes to be shared as well. Each items gets a URL you can send to a friend.
Poisoned
Open-source P2P file sharing program connects to the Gnutella, FastTrack and Ares networks.
Transmission
Enter the amazing world of torrents with this lightweight BitTorrent client. A simple, intuitive interface gives access to an efficient, cross-platform back-end. Also built on the BitTorrent concept is Tomato Torrent.
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Also try: Tomato Torrent
uTorrent
World’s most popular BitTorrent client features bandwidth prioritization, scheduling, RSS auto-downloading and Mainline DHT (compatible with BitComet). Supports the Protocol Encryption joint specification and peer exchange.
Vuze
Bittorrent app lets you find, download and play video files, with support for connecting to devices such as iPhone, iPod, Apple TV PS3, PSP, Xbox 360 and Tivo. Fast and convenient.