Archivers
Astronomy
Celestia: Space 3D simulator; and Add-ons- Marble: Virtual globe, includes Earth, the Moon, Venus, Mars and other planets
- Stellarium: Very realistic desktop planetarium
Chat and Social Networking
- Chatty: IRC client for Twitch
Discord
: Chat and VoIP designed for gaming- Konversation: IRC client for KDE
- Linphone: SIP VoIP client
MightyText: SMS from Computer or Tablet
Compilations
Content Management
E-mail and Calendaring
- K-9 Mail: Email client for Android
- Lightning Calendar: Mozilla add-on for calendaring
- Mozilla Thunderbird: Email/news client
- RoundCube: Webmail client; and Plugins
- WebCalendar: Calendaring application
Emulation
- Bizhawk: Multiplatform emulator with Lua scripting
- Citra: Nintendo 3DS emulator
- 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
- 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
- Solarus: Engine for games like ZSDX
- SuperTux: 2D platformer
- Vega Strike: Space Flight Simulator
Graphics and Viewers
- A Ruler For Windows: On-screen pixel ruler
- digiKam: Image organizer
- GIMP: Raster graphics editor
- PDF Split and Merge: Merge and split pdf documents
- PDFCreator: Create PDFs in Windows
Ham Radio
- AGW Packet Engine: Packet radio modem
- APRSdroid: APRS for Android
- Aprx: Terminal-based APRS iGate and Digipeater
- CHIRP: Tool for programming amateur radios
- EchoLink: VoIP for amateur radio
- EchoMac: EchoLink client
- Fldigi: Modem program for digital modes
- GtkMMorse: Morse code learning tool
- Hamlib: Ham radio control libraries
- JMorseTrainer: Morse code learning tool
- JT65-HF: Weak signal digital mode
- Just Learn Morse Code: Morse code learning tool
- Pocket RXTX: Android ham rig remote control
- QSSTV: SSTV and FAX
- Qtel: EchoLink client
- Soundmodem: Packet radio modem
- SvxLink: Voice services for transceivers, including EchoLink and Voice Mail
- Xastir: APRS client
Language and Literature
- Artha: English thesaurus
- BibleTime: Bible study tool
- BibleTime Mini
- Calibre: E-book library management application
- FBReader: e-Book reader
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
- Kodi: 10-foot user interface media player
- 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
- MuseScore: Music notation program
Office Suite
- LibreOffice: Office application suite
Operating Systems
- Android: Linux based mobile operating system
- Armbian: Debian optimized for other SBCs
- CloudReady: Chromium OS build for aging hardware
- DD-WRT: Router firmware
- Google Chrome OS: Linux distribution designed for web apps
- Lubuntu: Lightweight Linux distribution
- openSUSE: Linux distribution
- Raspberry Pi OS: Debian optimized for the Raspberry Pi
- ZynthianOS: Sound synthesis for Raspberry Pi
Programming: Automation
Programming: Editors and IDEs
Programming: Languages
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
Remote: Clients
- FileZilla: FTP, SFTP, and FTPS client
- iTerm2: Replacement for Terminal on macOS
- KiTTY: SSH, telnet, rlogin, and raw TCP client
- KRDC: VNC/RDP client
- qBittorrent: BitTorrent client
- RealVNC Viewer for Android: VNC viewer
- SFTP Net Drive Free: Mount SFTP servers to drive letters
- SSH Filesystem: Mount SFTP servers to folders
- Tunnelblick: OpenVPN client on MacOS
Remote: Servers
- Apache HTTP Server: Web server
- Barrier: KVM software
- FileZilla Server: FTP and FTPS server
- Pi-Hole: Network-level ad and tracker blocker
- TigerVNC: VNC remote desktop server and client
- TightVNC: VNC remote desktop server and client
Virtualization
- VirtualBox: x86 and x86_64 virtualization software
Web Browsers
- Chromium: WebKit web browser (Builds)
- Google Chrome: WebKit web browser
- Mozilla Firefox: Gecko web browser
Web Browsers Add-ons
- FluffBusting Purity: Facebook customizing browser extension
- FrankerFaceZ: Twitch interface enhancer
- Tampermonkey: Userscript manager
- uBlock Origin: Wide-spectrum blocker (Ad blocker)
Windows Support
- Dual Monitor Tools: Tools for multiple monitor setups
- Karabiner-Elements: Keyboard customizer for MacOS
- Winbolic Link: Symbolic links for Windows
- Wine: Compatibility layer for running Windows software
- Xming: X server for Windows
- XQuartz: X server for MacOS
- Note: All software packages listed are free software, except for packages marked as proprietary freeware.