List of recommended OS X software

For a more complete collection of terminal applications, be sure to check the GNU/Linux applications page.

Package Managers

Homebrew - Free
Cakebrew - Graphical client for managing Homebrew.
MacPorts - Free
Portage - Free

Terminal Applications

iTerm 2 - Free
TotalTerminal - Free

File Management

TotalFinder - $18

FTP Clients

Transmit for OS X.

Online Storage

Dropbox

Network Monitoring

Little Snitch - $35
Wireshark - Free

System Monitoring

MenuMeters - Free
iStat Menus - $16

Productivity

nvALT has a customizable interface.

Dropzone - $10
CloudApp - Free
imguru and imgurBar - Free
nvALT - Modified version of the lightweight note taking app Notational Velocity. Has the option to save notes as plain text files.
TodoTxtMac - Open source to-do manager for mac using the todo.txt format.

Audio Players

While expensive, Fidelia offers a lot of extra options and features for audiophiles.

iTunes - The default audio player. While not very customizable, it features good sorting options and integration. Can't play FLAC files.
Cog - A minimalistic but utilitarian playlist-centric audio player (similar to DeadBeeF on GNU/Linux or Foobar on Windows). GPL-licensed, with support for an enormous amount of formats. The original developer is MIA, but there are two very active forks: kode54's version, and mamburu's version.
Fidelia - At $20, it's a pretty harsh price for a music player. Unless you really need those advanced features, stick to a cheaper player.
Swinsian - Also $20, but made by a /g/ user.
Sonora - Original devs have abandoned it. Seemingly no github activity.
Ecoute
Enqueue - $10
Vox - Minimalistic alternative to iTunes that also has the ability to play FLAC.

Command line players

moc
cmus
ncmpcpp + mpd (+ mpdas for last.fm scrobbling.)

Audio Tools

last.fm - Find new music based on what you're listening to.
XLD

Audacity

Audacity is an easy-to-use, multi-track audio editor and recorder. Support for LADSPA, Nyquist, VST and Audio Unit effect plug-ins. Support for adding VAMP analysis plug-ins.

Video Players

Media Center and HTPC

Kodi

Kodi (former XBMC) is a free and open source (GPL) software media center featuring a 10-foot user interface for use with televisions and remote controls. It is highly customizable via skins and addons. There are even addons available for streaming from internet services like YouTube and Twitch.tv. It plays nearly every video and music format out of the box. The built in scrapers can pull data from sites like IMDB and thetvdb to allow sorting media by actor, genre, rating, etc. It can export this data to local files for offline use.

Plex

Plex is a fork of the former XBMC (now Kodi). It has separate front-end (player) and back-end (server) components. Plex Media Server, unlike the free frontend, is a combination of free and proprietary software, with the majority of the code being proprietary. It has many of the same features as Kodi, but focuses more on its web interface. It also excels at on the fly video transcoding to allow playback over slow connections.

Video Converters and Rippers

HandBrake

Handbrake is a free and open source video transcoder with an easy to use GUI. It can rip and convert a variety of video formats, but can not break DVD or Blu-ray copyright protection.

MakeMKV - Converts video from proprietary (and usually encrypted) discs into a set of MKV files, preserving most information but not changing it in any way. It can instantly stream decrypt video without intermediate conversion and decrypt Blu-rays and protected DVDs.
ProjectX - Resyncs DVB (Digital TV broadcasts) ready for encoding.
Youtube-dl - Command line program for downloading videos from Youtube and similar sites.

Web Browsers

For more detailed information see Web browsers.

Safari

Safari is the default web browser in Apple's Mac OS X. It is based on Apple's Webkit layout engine, a KHTML fork.

Webkit Nightly

Firefox

Firefox is free software developed by Mozilla. It is highly extensible via addons and included as the default browser in many Linux distributions.

QupZilla

QupZilla is a FOSS web browser, built on the Qt and QtWebEngine (based on Chromium's rendering engine) frameworks. It supports extensions, ships out of the box with AdBlock, Mouse Gestures, GreaseMonkey, Speed Dial, Click2Flash, and more. It provides seamless integration with most desktop environments, and has several other distinguishing features. QupZilla is licensed under GPLv3.

Opera

Opera is a proprietary web browser that has pioneered open web standards for over two decades. It is notable for being the first web browser to sport a tabbed interface. It is developed and maintained by Opera Software.

Chromium

Chromium is the developer version of Google Chrome. Its tracking features can be easily disabled. Although it is free and open source software, its code is not as well audited as Firefox.

Otter Browser

Otter Browser is a FOSS web browser that aims to recreate the best aspects of the classic Opera (12.x) UI using Qt5.

SeaMonkey

SeaMonkey is a continuation of the Mozilla suite. Unlike most modern web browsers, it is an Internet suite, complete with bundled programs for email, IRC, and web design. It is compatible with most Firefox add-ons.

Tor Browser

Tor Browser (formerly known as Tor Browser Bundle) is a package of a modified Firefox extended support release, NoScript, HTTPS-Everywhere, Tor, TorButton and TorLauncher. It automatically routes traffic through the Tor network and deletes history and cookies when closed.

Chat clients

Adium - Customizable chat client with loads of themes, soundpacks and other plugins.
Skype

RetroShare

RetroShare is an open source decentralized communication platform. It provides secure chat, photo and video sharing using OpenPGP to authenticate peers and OpenSSL to encrypt all communication.

Internet Relay Chat (IRC) Clients

HexChat

HexChat is a popular replacement for the XChat IRC client, a client which offered a free binary for Linux but charges money for the Windows version. HexChat is a continuation of XChat and makes both its source code and binaries available to users of all platforms it's created for. Like its parent software, HexChat is licensed under the GNU GPL. It includes all the basic features one would need, and can be ideal both for new users and IRC veterans.

Mail

Airmail for OS X.

Utilities

Application Launchers

Alfred - Simple but efficient application launcher. Best in combination with the Powerpack.
Launchbar - A little more complicated than Alfred, has a few convenient features that Alfred lacks.
Quicksilver

Ricing

Obsidian Menu Bar - Changes the color of the menu bar to black.
Bartender - Utility to clean up and manage your menu bar.
Geektool - Add shell scripts and images to your desktop.
Übersicht - Add widgets to your desktop using coffee script, bash, and css.
Bowtie - Customizable display for the music you're listening to.

Window Management

Spectacle - Open Source window managment tool.
BetterSnapTool
Moom

Password Managers

KeePassX

KeePassX a light interface and cross platform password manager published under the GNU GPL.

1Password - Safely store all your passwords.

Other

Growl allows for many different types of notifications.

BetterTouchTool

PCKeyboardHack - Change the functionality of the "Caps Lock" key.
KeyRemap4MacBook - Remap the keys on your keyboard and change the key repeat settings.
jitouch 2
Growl - Alternative notification system with good customization features. Best in combination with HardwareGrowler. $4 or build from source.
f.lux - Utility for changing the color tone of your display.
Automator
EiskaltDC++ - Direct connect client for file sharing.

System Maintenance

Misc.

coconutBattery - Utility for checking battery health.
Appcleaner - A free and good way to uninstall software.
Onyx

Disk tools

DaisyDisk gives you a graphical overview over used disk space.

DaisyDisk - Gives you a graphical overview over your file system.
Disk Inventory X - Free alternative to DaisyDisk.
Gemini - Intelligent duplicate remover.

BitTorrent Clients

Transmission

Transmission is a lightweight torrent client with support for blocklists.

qBittorrent

qBittorrent is a libtorrent-based BitTorrent client. According to the its developers, the aim of the client is to provide a free software alternative to µTorrent. There's also a daemon version called Qbittorrent-nox.

Deluge

Deluge is a libtorrent-based BitTorrent client. It is highly extensible via its plug-ins system. Deluge is notable for having originated the particular method of protocol encryption that is currently in use by every major BitTorrent client.

Terminal

qBittorrent-nox is an advanced command-line Bittorrent client written in C++ / Qt4, using the libtorrent-rasterbar library by Arvid Norberg. qBittorrent-nox aims to be a good alternative to other command line bittorrent clients and provides features similar to popular graphical clients. qBittorrent-nox is fast, stable, light and it supports unicode. It also comes with UPnP port forwarding / NAT-PMP, encryption (Vuze compatible), FAST extension (mainline) and PeX support (uTorrent compatible).

Deluge-Console is an ncurses interface for Deluge that generally comes bundled with the main GUI client.

rTorrent is a client with an ncurses interface brought to you by the people who make libtorrent.

Transmission-CLI is an ncurses interface for Transmission.

Archiving Tools

The Unarchiver or the CLI version
The Archive Browser - $4

7zip Archiver

7zip is a free and open source file archiver developed in C++ by Igor Pavlov. Its primary feature is lossless compression in the 7z format, based upon the Lempel–Ziv–Markov chain algorithm. In addition to the handful of formats it is capable of creating new archives in, 7zip can retrieve files from archives in virtually any format that one is likely to encounter. Only Windows binaries are provided on the site, but OS X and Linux binaries are available.

Coding

BBEdit
TextWrangler
TextMate
MacVim
Coda
Sublime Text
Any of JetBrains' IDEs (they have different IDEs for different languages)
Atom

3D Modeling

Blender

Blender is a 3D animation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation.

Images & Graphics

Compression

ImageAlpha - Program for reducing the file size of PNG files.
ImageOptim - Software for reducing the size of JPG and PNG files.

Editing

Pixelmator in action.

Preview - The default image viewing and editing app. Lightweight and functional alternative for simple edits.
Skitch - Simple editing program for adding anotations to images.
Pixelmator - A good and affordable ($30) alternative to photoshop.
Acorn - Similar to Pixelmator.
Sketch - Another alternative to Pixelmator.
GIMP - The GNU Image Manipulation Program. Free open source image editing program.
Camerabag - Easy-to-use photo editing tool.
InkScape - Vector graphic editor. FOSS.

Viewing

Preview
PhotoStickies - Stick photos to your desktop.

Virtualization

VirtualBox is free and open source (GPL) software. It was first developed by Innotek GmbH, then bought by Sun Microsystems and now continually developed by Oracle.

Qemu

Gaming

OpenEmu - Free video game emulation program.
Steam