Mozilla Firefox

The premier free, open-source browser. Tabs, pop-up blocking, themes, and extensions. Considered by many to be the world’s best browser.

Thunderbird

Email software with powerful spam filtering, solid interface, and all the features you need.

Audacity

Simple sound recording tool.

Juice

Solid podcasting client.

RSSOwl

Solid cross-platform RSS client.

Paint.NET

Graphics editor with a very nice interface.

Gimp

Photo editing application that rivals Photoshop in features.

Inkscape

Vector graphics application.

FileZilla

Excellent FTP program.

Media Player Classic

Compact, but powerful media player. Plays anything under the sun. No install necessary.

VLC

Plays more video files than most players: Quicktime, AVI, DIVX, OGG, and more. Pretty good interface.

Media Coder

Great tool for ripping CDs, DVDs, etc and converting between tons of video formats.

OpenOffice.org

Big, full featured suite of tools for word processing and spreadsheets. Compatible with and a free replacement for Microsoft Word documents. Also supports OpenDocument Format.

AbiWord

A word processor. Leaner and quicker than OpenOffice. Compatible with Microsoft Word documents and OpenDocument Format.

Pidgin

Pidgin is a multi-protocol Instant Messaging client that allows you to connect to multiple IM accounts simultaneously in a single app, including: AOL IM, MSN, and Jabber.

Stellarium

Renders realistic skys in realtime. Used in real planetariums.

KompoZer

Easy to use, open source WYSIWYG html editor.

Skype

Make calls to other skype users for free and to landline phones for a low rate.

NASA World Wind

Mapping tool similar to Google Earth for Windows. Must have the .NET Framework installed.

Google Earth

Google Earth lets you fly anywhere on Earth to view satellite imagery, maps, terrain, 3D buildings, from galaxies in outer space to the canyons of the ocean.

Picasa

Picasa is free photo editing software from Google that makes your pictures look great. Sharing your best photos with friends and family is as easy as pressing a button.

X-Chat 2

IRC client.

Keynote

Open Source note taking application.

Digsby

Instant Messenger, E-Mail, and Social Networks in one easy to use program.

Google Chrome

A very fast web browser from Google with support for Windows, Mac OS X, and Linux.

Freemind

An innovative application for note taking and outlining. Takes time to get used to, but some people swear by it.

Celestia

Open-source 3D planetarium software.

Blender

Powerful 3D Modeling software.

Ubuntu

Linux for Human Beings. A free open source alternative to Windows.

7-Zip

Archiving utility to extract and pack archives of an extensive amount of formats.