Archivers
Astronomy
Celestia: Space 3D simulator; and Add-ons- KStars: Desktop planetarium
- Marble: Virtual globe, includes Earth, the Moon, Venus, Mars and other planets
- Stellarium: Desktop planetarium
Chat and Social Networking
- Beeper
: Multi-network chat client built on Matrix 
BlueBubbles: Self-hosted service to remotely access iMessage running on MacOS- Chatty: IRC client for Twitch
- Discord: Chat and VoIP designed for gaming
FluffBusting Purity: Facebook customizing browser extension- FrankerFaceZ: Twitch interface enhancer
- Linphone: SIP VoIP client
- OpenBubbles: iMessage client
- Signal: Chat and VoIP
Compilations
- KDE: Cross-platform application compilation
Content Management
E-mail and Calendaring
- Mozilla Thunderbird: Email, calendar, news, and chat client
- WebCalendar: Calendaring application
Emulation and Virtualization
- Bizhawk: Multiplatform emulator with Lua scripting
- Dolphin-Emu: GameCube and Wii emulator
- DOSBox: MS-DOS emulator
- DraStic: Nintendo DS emulator for Android and Raspberry Pi
- EmulationStation: Emulator front-end, used in RetroPie
- Mupen64Plus: Nintendo 64 emulator
- RetroArch and Libretro: Frontend for emulators, game engines, and media players
- RetroPie: Retro-gaming machine
- VirtualBox: x86 and x86_64 virtualization software
- Wabbitemu: Z80 TI calculator emulator
- wxWabbitemu: Wabbitemu fork for Linux
Gaming
- AntiMicroX: Map gamepad keys
- Battle for Wesnoth: Turn-based strategy
- Frogatto & Friends: 2D platformer
- Frozen Bubble: Based on Puzzle Bobble
- MegaZeux: Game creation system
- Pioneers: Based on the Settlers of Catan board game
- PopTracker: Item and location tracker for randomized games
- Ship of Harkinian: Native compilation of Legend of Zelda: Ocarina of Time
- Solarus: Engine for games like ZSDX
- SuperTux: 2D platformer
- Vega Strike: Space Flight Simulator
Graphics and Viewers
- clawPDF: Create PDFs in Windows
- digiKam: Image organizer
- GIMP: Raster graphics editor
- PDFsam Basic: Merge and split pdf documents
Language and Literature
MacOS
- Homebrew: Package management system
- iTerm2: Replacement for Terminal on macOS
- Karabiner-Elements: Keyboard customizer for MacOS
- LaunchNext: Launchpad-like app launcher for Tahoe
- MiddleClick: Scroll wheel click with three finger Click or on MacBook trackpad
- OpenCore Legacy Patcher: Upgrade MacOS on older, unsupported Macs
- Platypus: Creates native MacOS apps from scripts
- XQuartz: X server for MacOS
Multimedia
- Audacity: Audio editor
- Avidemux: Simple video editing and transcoding
- BlackHole: MacOS virtual audio driver that allows applications to pass audio to other applications
- FFmpeg: Record, convert and stream audio and video
- HandBrake: Video transcodor
- K3b: CD/DVD burning application
- Kdenlive: Video Editor
- LAME MP3 Encoder: MP3 Encoder
- OBS Studio: Recording and live streaming
- Streamripper: Record streaming audio
- VLC Media Player: Multimedia player, encoder, and streamer
Music Composition
- Aeolus: Pipe organ synthesizer
- FluidSynth: SF2 and SF3 synthesizer
- LinuxSampler: GIG and SFZ synthesizer
- MuseScore: Music notation program
- Plogue sforzando: SFZ, SF2, and DLS synthesizer
- Polyphone: Soundfont editor
Network: FTP and SSH
- FileZilla: FTP, SFTP, and FTPS client
- FileZilla Server: FTP and FTPS server
- KiTTY: SSH, telnet, rlogin, and raw TCP client
- macFUSE: FUSE for MacOS
- SSH Filesystem: Mount SFTP servers to folders
- SSHFS-Win: SSHFS for Windows using WinFsp
- SSHFS-Win Manager: GUI frontend for SSHFS on Windows
- WinFsp: FUSE for Windows
Network: Other
- Apache HTTP Server: Web server
- InputLeap: KVM software
- qBittorrent: BitTorrent client
Network: Tracker and Ad Blocking
- Pi-Hole: Network-level ad and tracker blocker
- uBlock Origin Lite: Wide-spectrum blocker (Ad blocker)
Network: VNC
- RealVNC Viewer for Android: VNC viewer
- TigerVNC: VNC remote desktop server and client
- TightVNC: VNC remote desktop server and client
Network: VPN
- OpenVPN Community Edition
- PiVPN: Setup and manage Wireguard or OpenVPN servers
- Tailscale: P2P and Relayed VPN based on WireGuard
- Tunnelblick: OpenVPN client on MacOS
Office Suite
- LibreOffice: Office application suite
Operating Systems
- Android: Linux based mobile operating system
- ChromeOS Flex
- Lubuntu: Linux distribution
- openSUSE: Linux distribution
- Raspberry Pi OS: Debian optimized for the Raspberry Pi
- ZynthianOS: Sound synthesis for Raspberry Pi
Programming: Automation
- Appium: Automation software testing framework for native, hybrid and mobile web applications
- AutoIt: Windows GUI Automation
- Newman: Terminal-based collection running
- Playwright: Automated software testing framework
- Selenium: Automated software testing framework for web applications
Programming: Editors and IDEs
Programming: Languages
- Eclipse Temurin: OpenJDK (Java) from Adoptium
- GCC: Compiler system
- MSYS2: Tools and libraries for building on Windows
- MySQL: Relational database management system
- Perl: Programming language
- PHP: Scripting language for web development
- Python: Programming language
- Strawberry Perl: Perl for Windows
Programming: MathStat
- Cantor: GUI frontend for R, Maxima, Octave, and others
- GNU Octave: Numerical computations
- Maxima: Computer algebra system
- R: Statistical computing and graphics
- wxMaxima: GUI frontend for Maxima
Web Browsers
- Chromium: WebKit web browser (Builds)
- Google Chrome: WebKit web browser
Windows
Note: All software packages listed are free software, except for packages marked as proprietary freeware.
as proprietary freeware.