Web Browsers
* Firefox - Quick and Secure Web Browser
* Camino – A good looking Mac-styled browser, built on the Firefox engine.
* Safari – The default browser included with OS X, with a bunch of new features in the latest release.
* Opera – A powerful browser with a few new interesting features; speed dial, search shortcuts, and a tab trash can.
* Omniweb – Taking a different approach, and assisting you with online research
Audio
* QLab – Live Media Timelines for Mac OS X
* UltraMixer – Professional Digital DJ Solution to Mix Digital Music in Various Formats.
* ToolPlayer – Simple Music Player for OS X that Supports FLAC, MP3, Apple Lossless, AIFF, WAV, etc
* SimpleSynth – Plug MIDI Keyboard and Play with SimpleSynth
* Spotify – Spotify allows you to stream almost any song you can imagine via the internet. Access is free, though you’ll need to listen to a short advertisement every few songs.
* Songbird – A non-proprietary, cross platform, extensible tool with a great interface
* iTunes – The de-facto music player for OS X, Windows and iPod users
* Audion 3 – Now discontinued, but worth checking out
* Juice – A quality app for browsing and downloading podcasts
* Audacity – For editing and converting audio files.
Email, Chat and RSS
* Thunderbird – Email Application to Help You Organize, Secure and Customize Your Mail
* Adium – Free Universal Instant Messaging Application for Mac
* Microsoft Messenger – MSN Messenger Client for Mac
* Skype – Application for Phone Call over Internet
* Colloquy – Advanced IRC, SILC and ICB Client
* Hab.la – Live Chat Application with Website’s Visitors
* NewsFire – A stylish RSS reader
* Vienna – Providing features comparable to commercial newsreaders for free.
* Shrook - A next-generation news reader
* RSSOwl – Filtering, labels and completely cross platform
* Dashboard RSS Reader – Keep RSS information easily accessible via Dashboard
* TweetDeck - Multi paned browsing, and very popular
* Twitteriffic – The classic Twitter client, with a great UI
* Twhirl – Friendly, colorful, and great multiple account support.
* EventBox – For Twitter, and a bunch of other social media networks
* Tweetr – Easy file sharing and webcam support
Video
* VLC Media Player – Cross-Platform Multimedia Player
* RealPlayer – Mac OS X Version of RealPlayer
* Flash Player – Flash Player for Your Mac
* ooVoo – Free Video Chat and Video Conferencing
* Jing – Instantly Captures Images and Records Video
* FrameByFrame – Stop Motion Movie Creator for Mac
* AutoRate – iTunes Rating Made Easy
* Miro - Aiming to provide easily accessible, fully intergrated internet video
* Flip4Mac WMV – For enabling WMV videos in QuickTime
* Handbrake – The ultimate tool for converting video between formats
* Perian - An open source QuickTime component that adds native support for many popular video formats.
* DivX Player – A simple, free player for DivX files.
Photo
* iPhoto – The in-built photo app on OS X, with face recognition and geo-tagging support.
* Gimp – A free, cross platform photo editor.
* Seashore – Built on GIMP, with a slightly different user interface
* Flickr Uploader – A simple and free solution for uploading Flickr photos
* JetPhoto – Feature-rich and easy-to-use digital photo software
* Picasa – Picasa is designed and owned by Google. It offers a bunch of great features, and is also capable of sharing photos online.
FTP & File Sharing
* Cyberduck - A free alternative to commercial FTP applications
* Filezilla – Great for accessing FTP servers, and completely cross-platform
* Acquisition – In-built torrent searching and integration with iTunes.
* Tomato Torrent - A slightly dated but perfectly functional torrent manager
* Classic FTP -Easy to Use FTP Client
Office & Text Editor
* TextWrangler – A great, free, code editor for OS X
* Bean – A small, easy-to-use rich text processor
* AbiWord – A full featured, open source alternative to Open Office
* Smultron – Good looking, and great for web programming, script editing, making a to do list etc.
* jEdit – Aimed at technical users, an editor specifically for programming
* OpenOffice – OpenOffice is a worthy alternative to Microsoft Office, and comes at a far more attractive price
Utilities
* Growl – A great system-wide notification system
* Disk Inventory X – For viewing a graphical representation of what’s eating up your hard drive
* AppCleaner – Allows you to remove any trace of an application
* Smart Reporter – Be notified if your hard drive seems likely to fail
* FuzzyClock – A fun and slightly less formal way to display the time in your menu bar.
* Quicksilver – Quicksilver is a powerful shortcut tool, which allows you to manipulate files and work with applications – all without needing to open them.
* Paparazzi – Utility for Mac OS X to Make Screenshots of Webpages
* Linotype FontExplorer X -Font Management Application
* iStat Pro – Highly Configurable Mac OS X Widget that Helps You Monitor Your System
System
* Deeper – Personalization Utility for Mac OS X which Reveals Hidden Settings
* MacLoc – Log Out from System without Closing Applications
* OnyX – Multifunction Utility for Maintenance, Optimization and Personalization of Your System
* Loginox – Application for Easier Customization of Login Screen
* Mactracker – Mactracker Provides Detailed Information on Every Apple, Motorola, PowerComputing, and UMAX Mac OS Computers
* SuperDocker – Little Application to Help You Modify Your Dock, Dashboard or Safari Loading Bar’s Appearance with Simple Drag & Drop
File Management
* AppCleaner – Small Application to Allow You Thoroughly Uninstall Unwanted Apps
* AppFresh - Application to Keep All Applications Up-To-Date
* Carbon Copy Cloner - Clone, Synchronize and Backup Your Files
* SpotInside – Search and Look Inside Documents
Torrents
* Transmission – Multi-Platform BitTorrent Client
* Vuze – The Reigning Heavy-Weight BitTorrent Client