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