Adium
A free instant messaging app that can connect to AIM, MSN, Jabber, Yahoo, and more. Under active development and highly recommended. Another popular choice is Mercury Messenger, which runs on Java. Or if you prefer IRC, there is Colloquy. Or you can get an open source clone of MSN called aMSN. And now Proteus is free — no registration required.
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Also try: Mercury Messenger
Colloquy
aMSN
Proteus
Chrome
Google’s increasingly popular web browser promises lightning speed.
Cyberduck
The thriftmac FTP client of choice has a nice Mac-like interface and can take on most jobs without any trouble. For those with heavy-duty demands, check out FileZilla below. Fugu is also quite good, but it’s limited to SFTP.
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Also try: Fugu
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.
Echofon
Twitter client features a clean interface, the ability to sync with your iPhone, drag-and-drop attachments, a browser drawer and multiple accounts. The free version has ads.
Firefox
When it comes to web browsers, it may seem that the obvious choice is Safari — a great program that comes installed with your Mac. There are, in fact, many free alternatives to choose from. The most popular is Firefox, but there are those who swear by Camino or the contender from Google — Chrome. And now, Opera and OmniWeb are free. Each has its pros and cons, so it can’t hurt to at least try them out.
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Also try: Camino
Chrome
Opera
OmniWeb
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.