Utilities - The Unarchiver

The Unarchiver

Uncompress RAR, 7zip, tar, and bz2 files on your Mac. Many new Mac users will be puzzled the first time they download a RAR file. Do them a favor and download UnRarX for them!

 fonte: http://wakaba.c3.cx/s/apps/unarchiver.html

Email - Mozilla Thunderbird

Mozilla Thunderbird

Powerful spam filtering, solid interface, and all the features you need.

 

fonte: http://www.mozilla.org/products/thunderbird/

Application Launching - Quicksilver

Quicksilver

Quicksilver lets you start applications (and do just about everything) with a few quick taps of your fingers. Warning: start using Quicksilver and you won't be able to imagine using a Mac without it.

 fonte: http://www.macupdate.com/

Video Converter, iPhone Converter - Miro Video Converter

Miro Video Converter

Convert any type of video to mp4 or theora. Convert any video for use with iPhone, iPod, Android, etc. Very clean, easy to use interface.
Mac App Store (free)

 

fonte: http://www.mirovideoconverter.com/

IM - Instant Messaging - Adium

Adium

Connect to multiple IM accounts simultaneously in a single app, including: AOL IM, MSN, and Jabber. Beautiful, themable interface.

 

fonte: http://adiumx.com/