Top Free Mac Applications

This is comprehensive list of our top favourite free Mac OSX software, including a mix of open source and closed source application available for anyone to download.  This isn't a list of most common programs, but a list of what we have found to be best in their free categories.   We use these programs day in and day out; they've been tried and tested by our tech savy "panel of judges", tested to breaking point and so in our opinion if it's not here, you don't need it!

Listed below are all FREE must-have applications, and we highly recommend them.

3D Animation/Design

Blender 3D (we also highly recommend using Blender with BetterTouchTool)
Google SketchUp
MeshLab 

Accounting Applications

GnuCash (great for managing your personal finance, we don't recommended it for business use)

Astronomical Applications

Celestia
Stellarium 

Audio Conversion

Max 

Audio Editing

Audacity

Automation

JBidwatcher (automatically place bids on eBay)

Boot Loaders

UNetbootin (creates USB boot devices)

Browsers

Firefox
Google Chrome 

Calendar/Time Management

Time Tracker
Remind Me Later

Chat Applications

Adium (supports AOL, Jabber, MSN, Yahoo, Facebook, GTalk, ICQ, IRC, LiveJournal, Lotus, MySpaceIM, Novell, SIP, StatusNet, Twitter and includes scripting!)
Skype 

Database Editor

SQLite Database Browser

Development IDE's

Eclipse

Download Management

ProgressiveDownloader
Transmission (torrents) 

Emulators

Dolphin
ScrummVM 

File Archives

The Unarchiver

File Editors

Kod

File Encryption

TrueCrypt

File Information Applications

MediaInfo (reads almost any video/audio file and supports hundreds of formats, codecs and parameters)

File Transfer Applications

Cyberduck (amazing app that supports FTP, SFTP, SSH, SCP)

File Tools/Applications

HashTab (supports CRC32, MD5 & SHA1)
JDiskReport (generates directory space usage reports)
OSXFuse 

Firewall

WaterRoof (for advanced iptables modification of OSX)

Games

Hedgewars (fun free Worms alternative)
SuperTuxKart 
Suqoku 

Hex Editors

0xED
WxHexEditor 

Image Editors

GIMP (free photoshop equivalent image editor)
Inkscape (vector based editor that supports SVG, SVGZ, PS, EPS, FX, ODG, TEX, DXF formats and more)

Image/Photo Management

Picasamac

Mail Applications

Thunderbird

Music Management

iTunes

Network Management

GNS3 (graphical network simulation software)
BitCricket IP Calculator (excellent network subnet calculator supporting CIDR, IPv4, IPv6)

Network Monitoring

Wireshark

Network Pentesting

KisMAC (wireless pentesting)
Metasploit (exploit pentesting)

Office Applications

OpenOffice

Optimisation

Desktoday

Package Management

FreeDMG (for creating software DMG package files)
Homebrew 

Remote Access

Chicken of VNC (remote access viewer to VNC servers)
SSH Tunnel Manager
OpenVPN

Video Conversion

Handbrake (support includes VOB, MKV, MP4, MV4, BR and in 64-bit!)

Video Player

VLC (the best free video player under Mac OSX with very few contenders)
XBMC (media centre style manager - best setup on a dedicated linux box)

Video Subtitles

Jubler (video subtitle editor)

VoIP Applications

Telephone