List of awesome opensource applications for macOS.

Applications

Audio

• Background Music - Background Music, a macOS audio utility: automatically pause your music, set individual apps' volumes and record system audio.
• Cog - A Free and Open Source Audio Player for Mac OS X 10.7+.

Video

• IINA - The modern video player for macOS.
• Yoda - Yoda is a nifty osx application which enables you to browse and download videos from YouTube.

Social Networking

• Goofy - Unofficial Facebook Messenger client.
• Caprine - An elegant Facebook Messenger desktop app

Chat

• ChitChat - A native Mac app wrapper for WhatsApp Web.
• Telegram Desktop - Telegram Desktop messaging app
• Textual - Textual is an IRC client for OS X
• Electronic WeChat - A better WeChat on macOS and Linux.
• Caprine - Elegant Facebook Messenger desktop app.
• Ramme - Unofficial Instagram Desktop App.
• Telegram [Deprecated] - Source code of deprecated Telegram for macos version.
• Telegram - Source code of Telegram for macos on Swift 4.0

Development

• Cakebrew - Manage your Homebrew formulas with style using Cakebrew.
• CocoaRestClient - A free, native Apple macOS app for testing HTTP/REST endpoints.
• Gas Mask - Hosts file manager for OS X.
• gitbar - Open source github contribution stats on your Mac OS X Menu Bar
• GitHub Desktop - Simple collaboration from your desktop
• GitUp - The Git interface you've been missing all your life has finally arrived.
• Hosts - a Cocoa GUI for /etc/hosts.
• ImageAlpha - Mac GUI for pngquant, pngnq and posterizer.
• ImageOptim - GUI image optimizer for Mac.
• Knuff - The debug application for Apple Push Notification Service (APNs).
• Postgres.app - The easiest way to get started with PostgreSQL on the Mac.
• QorumLogs - Swift Logging Utility for Xcode & Google Docs.
• Sequel Pro - MySQL/MariaDB database management for macOS.
• Touch Bar Simulator - Use the Touch Bar on any Mac.
• Unused - A Mac app for checking Xcode projects for unused resources.
• Vagrant Manager - Manage your vagrant machines in one place with Vagrant Manager for macOS.
• WWDC - The unofficial WWDC app for macOS.
• Reactotron - A desktop app for inspecting your React JS and React Native projects. macOS, Linux, and Windows.
• SwiftyBeaver - Convenient logging during development & release in Swift.
• Shuttle - A simple SSH shortcut menu for macOS.
• Lepton - Democratizing Code Snippets Management (macOS/Win/Linux)
• iOS Images Extractor - iOS Images Extractor is a Mac app to normalize , decode and extract images from iOS apps.
• SmartPush - iOS Push Notification Debug App.
• Finder Go - A macOS app and Finder Sync Extension to open Terminal, iTerm, Hyper from Finder
• JSONExport - JSONExport is a desktop application for Mac OS X which enables you to export JSON objects as model classes with their associated constructors, utility methods, setters and getters in your favorite language.

IDE

• Atom - The hackable text editor.
• ZeroBraneStudio - ZeroBrane Studio is a lightweight cross-platform Lua IDE with code completion, syntax highlighting, remote debugger, code analyzer, live coding, and debugging support for various Lua engines.

Editors

• CotEditor - Lightweight Plain-Text Editor for macOS.
• MacVim - Vim - the text editor - for macOS.
• TextMate - TextMate is a graphical text editor for macOS.
• VimR - Project VimR — Refined Neovim experience for macOS.
• CotEditor - CotEditor is a lightweight plain-text editor for macOS.

Games

• Battle for Wesnoth - Turn-based tactical strategy game, featuring both single-player and online multiplayer combat.
• Boxer - The DOS game emulator that’s fit for your Mac.
• Dolphin - A powerful, Open Source emulator for Nintendo GameCube and Wii games.
• OpenEmu - Retro video game emulation for macOS.
• Screentendo - Turn your screen into a playable level of Mario.
• Stockfish - Beautiful, powerful chess application.

Graphics

• GifCapture - Gif capture app for macOS.
• Sketch Toolbox - A plugin manager for Sketch.app.
• Aseprite - Animated sprite editor & pixel art tool (Windows, macOS, Linux).

Productivity

• ClipMenu - A clipboard manager for Mac OS X.
• Karabiner - Karabiner (KeyRemap4MacBook) is a powerful utility for keyboard customization.
• Quicksilver - Quicksilver is a fast and free Mac OS X productivity application that gives you the power to control your Mac quickly and elegantly.
• SelfControl - Mac app to block your own access to distracting websites etc for a predetermined period of time. It can not be undone by the app or by a restart – you must wait for the timer to run out.
• Telephone - SIP softphone for Mac.
• Karabiner-Elements - Karabiner-Elements is a powerful utility for keyboard customization on macOS Sierra (10.12) or later.
• Boostnote - Boostnote is an open source note-taking app made for programmers just like you.

Sharing Files

• mac2imgur - A simple Mac app designed to make uploading images and screenshots to Imgur quick and effortless.
• Transmission - Official Transmission BitTorrent client repository.

Terminal

• iTerm 2 - iTerm2 is a terminal emulator for Mac OS X that does amazing things.
• Alacritty - A cross-platform, GPU-accelerated terminal emulator

Utilities

• AnyBar - OS X menubar status indicator.
• APNGb - macOS app which assembles and disassembles animated png files.
• BeardedSpice - Control web based media players with the media keys found on Mac keyboards.
• BitBar - Put the output from any script or program in your Mac OS X Menu Bar.
• ControlPlane - Automate running tasks based on where you are or what you do.
• DisableMonitor - Easily disable or enable a monitor on your Mac.
• EtreCheck - EtreCheck is an easy-to-use macOS app to display important details of your system configuration and allow you to copy that information to the Clipboard.
• Fanny - Monitor your Mac's fan speed and CPU temperature from your Notification Center.
• Finicky - Finicky - always opens the right browser.
• gfxCardStatus - gfxCardStatus is an open-source menu bar application that keeps track of which graphics card your unibody, dual-GPU MacBook Pro is using at any given time, and allows you to switch between them on demand.
• Helium - A floating browser window for OS X.
• Irvue - Screensaver for macOS.
• Kawa - A better input source switcher for OS X.
• KeepingYouAwake - Prevents your Mac from going to sleep.
• Loading - Simple network activity monitor for OS X.
• MacDown - Open source Markdown editor for macOS.
• Mackup - Keep your application settings in sync (OS X/Linux).
• MacPass - A native OS X KeePass client.
• Menubar Colors - A macOS app for convenient access to the system color panel.
• MenuMeters - A set of CPU, memory, disk, and network monitoring tools for macOS.
• Noti - Receive Android notifications on your mac (with PushBullet).
• ShiftIt - Managing windows size and position.
• SlowQuitApps - Add a global delay to Command-Q to stop accidental app quits.
• Übersicht - Keep an eye on what's happening on your machine and in the world.
• The Unarchiver - The Unarchiver is an Objective-C application for uncompressing archive files.
• WebTorrent Desktop - Streaming torrent app for Mac, Windows, and Linux.
• Satellite Eyes - Satellite Eyes is a small OS X application that sits in your system tray (next to the clock) and automatically updates your desktop wallpaper to the satellite or map view overhead.
• Turbo Boost Switcher - Turbo Boost Switcher is a little application for Mac computers that allows to enable and/or disable the Turbo Boost feature.
• AppPolice - An app for Mac OS X with a minimalistic UI which lets you quickly throttle down the CPU usage of any running process.
• WebPonize - WebPonize is a Mac OS App for converting PNG, JPEG, animated (or not) GIF images into WebP.
• Muzei - Muzei wallpaper app for macOS
• Clean-Me - A small macOS app that acts as a system cleaner (logs, cache, ...)
• Simplenote - The simplest way to keep notes.

Video

• HandBrake - HandBrake is an open-source video transcoder available for Linux, Mac, and Windows.
• Subler - Subler is an Mac OS X app created to mux and tag mp4 files.
• Subtitlr - Subtitlr is an open source OS X app used to find and download subtitles easily.
• MPlayerX - Media player on Mac OS X

Window Management

• Amethyst - Automatic tiling window manager for macOS.
• Hammerspoon - Staggeringly powerful OS X desktop automation with Lua.
• kwm - Tiling window manager with focus follows mouse for OSX.
• Phoenix - A lightweight macOS/OS X window and app manager scriptable with JavaScript.
• Spectacle - Spectacle allows you to organize your windows without using a mouse.

Mail

• gInbox - A Mac wrapper for Inbox by Gmail.
• Nylas Mail - The open-source, extensible mail client
• Rambox - Free, Open Source and Cross Platform messaging and emailing app that combines common web applications into one.

VPN & Proxy

• Tunnelblick - Tunnelblick is a free, open source graphic user interface for OpenVPN on OS X.
• ShadowsocksX-NG - Next Generation of ShadowsocksX.
• SpechtLite - A rule-based proxy app for macOS.

Wallpaper

• Muzei - Muzei wallpaper app for macOS.
• OS-X-Wallpaper-Changer - Applescript for changing the Mac OS X desktop picture based on the time of day.
• BingPaper - Use Bing daily photo as your wallpaper on Mac OS X.
• Satellite Eyes - Mac OS X app to automatically set your desktop wallpaper to the satellite view overhead.
• Sunscreen - Sunscreen is a fun, lightweight application that changes your desktop wallpaper based on sunrise and sunset.
• WallpaperMenu - WallpaperMenu is a Mac OS X menubar application that navigates through beautiful pictures on the web and set them up as your desktop image.
• ArtWall - ArtStation set as wallpapers from https://www.artstation.com/artwork.rss.
• Image-As-Wallpaper - Utility application helps with selection of images for using as desktop wallpaper or in screensaver on Mac computers.
• earth-wallpapers - Simple Mac OS X menubar app which fetches latest photos from a subreddit.
• 500-mac-wallpaper - Simple Mac os app for the status bar to automatically download photos from 500px.com to a local folder that can be set as a source of wallpapers.
• Desktop Wallpaper Switcher - A Win / Linux / Mac OS tool for managing and cycling desktop wallpapers.
• pyDailyChanger - pyDailyChanger is a program that changes your wallpaper daily.
• osx-10.5-leopard-wallpapers - A copy of the wallpapers folder from an old installation DVD of Mac OS X 10.5 Leopard.
• BingPaper - Use Bing daily photo as your wallpaper on mac os x.

Others

• Aerial - Apple TV Aerial Screensaver for Mac.
• Catch - Catch: Broadcatching made easy.
• Clocker - macOS app to plan and organize through timezones.
• hacker-menu - Hacker News Delivered to Desktop.
• Sonora - A minimal, beautifully designed music player for OS X.
• SoundCleod - SoundCloud for macOS and Windows.
• Juice - Make your battery information a bit more interesting.
• Vienna - Vienna is a free and open-source RSS/Atom newsreader for macOS.
• Brave Browser - Brave browser for Desktop and Laptop computers running Windows, OSX, and Linux.
• Kap - An open-source screen recorder built with web technology
• ScreenCat - ScreenCat is an open source screen sharing + remote collaboration application.