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.
Download Page

Camino

Based on the same Mozilla foundation as Firefox, Camino is a more native OS X app. Fast and simple.
Download Page

Miro

Beautiful interface. Plays any video type (much more than quicktime). Subscribe to video RSS, download, and watch all in one. Torrent support. Search and download from YouTube and others.
Download Page

Adium

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.
Download Page

MacLibre

Installs a pack of great open source apps (including many on this page) and keeps them updated for you.
Download Page

Mozilla Thunderbird

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

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!
Download Page

Vienna

Very nice, native RSS client.
Download Page

RSSOwl

Solid cross-platform RSS client.
Download Page

Cabos

A simple, easy to use filesharing program. Gnutella network.
Download Page

Transmission

Very nice torrent downloader.
Download Page

Q Emulator

Run Windows programs on your Intel Mac at near native speed. Works on G4 / G5 Macs too, but much slower.
Download Page

Juice

Solid podcasting client.
Download Page

VLC

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

MPlayer

The interface and buttons are not as nice or as Mac-like in feel, but it may play even more video files than VLC.
Download Page

Perian

A plugin that allows quicktime to play additional video formats. (Included in Democracy Player.)
Download Page

Senuti

Get music off of your iPod onto any computer.
Download Page

iPodDisk

Copy music off your iPod in the finder, like a regular disk drive.
Download Page

Handbrake

DVD ripper and MPEG-4 / H.264 encoding. Very simple to use.
Download Page

Burn

CD and DVD Burner. Burn any video to a disc that plays in your DVD player!
Download Page

Vidalia

This TOR frontend keeps you anonymous on the web using military-grade techniques. For use with Firefox see: TorButton.
Download Page

Bean

Very fast and easy to use word processor. Live word count, autosaving, more.
Download Page

NeoOffice

Built on OpenOffice.org. Big, full featured suite of tools for word processing and spreadsheets. Compatible with Microsoft Word documents and OpenDocument Format.
Download Page

AbiWord

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

KisMac

The best wireless scanner for Mac. Find wireless access when you’re on the go.
Download Page

Audacity

Simple sound recording tool.
Download Page

Seashore

Based on Gimp, but doesn’t require X11.
Download Page

Xee

Fast image viewer and image browser.
Download Page

Gimp.app

Photo editing application that rivals Photoshop in features (requires X11).
Download Page

Inkscape

Vector graphics application (requires X11).
Download Page

Scribus

Desktop publishing. Complicated install, but a nice app.
Download Page

Cyberduck

Very good all-around ftp program.
Download Page

OneButton FTP

Simple, fast FTP, with a focus on “advanced queuing”.
Download Page

Fugu

Not as polished as Cyberduck (and only for SFTP) but has a side by side interface showing your files and the remote files.
Download Page

Smultron

Text / html editor. Integrates with Cyberduck for editing websites.
Download Page

Nvu

Visual tool for making websites (WYSIWYG html editor), comparable to Dreamweaver.
Download Page

Colloquy

Great IRC client.
Download Page

Media Center

Centerstage

Full-screen interface for playing audio, video, and photos. Connect it to your TV.
Download Page

Note Taking

Freemind

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

Personal Finance

Cashbox

Simple, easy to use application for managing personal finances.
Download Page

Buddi

A personal finance and budgeting program, aimed at those who have little or no financial background.
Download Page

MSN Chat

More Web Browsing

Shiira

Fast, nice web browser.
Download Page

SunriseBrowser

Good webkit-based browser created with special tools for web designers.
Download Page

Seamonkey

Full-featured Mozilla browser, used to be called ‘Mozilla Suite’.
Download Page

PDF Viewer

Skim

PDF viewer.
Download Page

Screensaver

Electric Sheep

Immersive, trippy screensaver.
Download Page

More Filesharing

Tomato Torrent

Download torrents. Nice and simple.
Download Page

3D Graphics and Modeling

Blender

Powerful 3D Modeling software.
Download Page

MP3 Management

iEatBrainz

Fills in the correct metadata (title, artist, etc) for MP3s in your collection.
Download Page

Planetariums and Outer Space

Celestia

Open-source 3D planetarium software. Akin to traveling through space (outer space).
Download Page

Stellarium

“Renders realistic skys in realtime.” See what you would see if your city wasn’t so light-polluted. Used in real planetariums.
Download Page

Comic Viewer

Jomic

Read digital comics.
Download Page

Dance Dance Revolution

Stepmania

Dance Dance Revolution clone. Can connect to external dance pads.
Download Page

Games

Cube

Nice first-person shooter.
Download Page

Marathon: Aleph One

Engine for Bungie’s free FPS series Marathon. Play online, solo play with rich original story, many total conversions and thousands of maps.
Download Page

Zombies

3D zombie strategy game.
Download Page

Armagetron Advanced

3D Tron game.
Download Page

BZFlag

First-person tank game.
Download Page

Battle for Wesnoth

Fantasy / Strategy Game
Download Page

del.icio.us Client

Cocoalicious

Let’s you easily post to del.icio.us.
Download Page

Free File Hosting

CC Publisher

Host Creative Commons video or audio files for free on archive.org with this easy uploader.
Download Page

Quick Links

Rapidshare / Torrent Searcher: Share4Vn.com

Viewers Comic viewer: Comical
Comic viewer: FFView
OpenDocument viewing application: ODF Viewer

RSS and Usenet
RSS Reader: Feed
Cross-platform RSS reader: BlogBridge
RSS video podcast player: I/ON
Usenet Reader: OSXnews

IM, IRC, Chat
Multi-IM: Fire
Powerful IRC client: X-Chat Aqua
Videoconferencing client: XMeeting
PBX / Voip system: Asterisk

Graphics and Art
Draw on a moving canvas: Cosmic Painter
Image editor: Seashore
An artwork scaling calculator: Scaletron!
A Paint-like program designed for pixel-pushers: Pixen
A VRML/X3D Browser: FreeWRL
Video
Realtime Editing and Effects System: Jahshaka
Video transcoder: ffmpegX
MPEG convertor: MPEG Streamclip

Music and Audio
OGG Vorbis encoder (ogg is an open source audio codec): Ogg Drop
Music notation: LilyPond
Play and compose live music: Miraton
Max/MSP style realtime music and multimedia environment: Pd
Manage chords, lyrics, and projection: OpenSong

Wifi / Networking
Discover open wifi networks: iStumbler
A Prism/Prism2 driver 802.11: WirelessDriver
Fast, lightweight VNC client: Chicken of the VNC
VNC server providing remote access to the GUI, keyboard and mouse: OSXvnc

Utilities
Manage disk space: DiskInventoryX
Book management: Books
CD / DVD Burning: SimplyBurns
Disable sleep on a Mac: InsomniaX
Protect your laptop with a car-alarm style alarm: Multialarm
Remove extra languages from OSX to save disk space: Monolingual
System event notifications: Growl
System performance monitors: MenuMeters
Virtual desktop tool: Desktop Manager
Virus checker: ClamXav
Share mouse and keyboard between 2 or more computers: SynergyKM and Quick Synergy
Check available RAM: Memtest
Monitor CPU, RAM, battery, CPU temp, network, I/O, and more: X Resource Graph
Control your Mac via Bluetooth: Romeo

Writing and Typesetting
Screenplay writing and pre-production support: Celtx
Bibliography manager, BibTeX .bib format: BibDesk
Typesetting - TeX previewer for Mac OS X: TeXShop
Typesetting: iTexMac

Education
Education course management system: Moodle
Student information system: Focus / SIS
Another student information system: Centre

Programming
Development platform: Eclipse
SQL Editor: YourSQL

Math and Engineering
General purpose computer algebra system: Yacas
GNU S language: R
MATLAB style rapid engineering and scientific prototyping / data processing: FreeMat