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Archivers

Windows7-Zip: File archiver and format
LinuxArk: File archiver
MacOSXKeka: File archiver
LinuxMacOSXp7zip: File archiver and format

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Astronomy

AndroidAstronomy Picture of the Daynot foss: APOD homescreen wallpaper
LinuxMacOSXWindowsCelestia: Space 3D simulator; and Add-ons
LinuxMacOSXWindowsKStars: Desktop planetarium
AndroidLux Litenot foss: Auto brightness solution, include red Astronomy mode
LinuxMacOSXWindowsStellarium: Very realistic desktop planetarium
LinuxMacOSXWindowsXplanet: Planetary and solar system image renderer

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Chat and Social Networking

MacOSXAdium: Instant messaging client
LinuxWindowsBlogilo: Blogging client
LinuxMacOSXChoqok: Microblogging client
Chrome OSCIRC: IRC client for Chrome
LinuxMacOSXFinch: Terminal-based instant messaging client
LinuxMacOSXWindowsIrssi: Terminal-based IRC client
LinuxMacOSXWindowsKonversation: IRC client for KDE
AndroidLinuxMacOSXWindowsLinphone: SIP VoIP client
Add-onAndroidMightyTextnot foss: SMS from Computer or Tablet
Add-onOTR plugin for Pidgin: Pidgin add-on for Off-the-Record messaging
LinuxMacOSXWindowsPidgin: Instant messaging client
Add-onpidgin-mightytext: Pidgin add-on for MightyText
Add-onSipe: Pidgin add-on for Microsoft LCS/OCS
AndroidXabber: XMPP client for Android

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Compilations

WindowsCygwin: Unix Tools for Windows
MacOSXFink: Unix tools for MacOSX
LinuxKDE: Cross-platform application compilation
MacOSXKDE for Mac
WindowsKDE for Windows
MacOSXMacPorts: Package management system for Mac
WindowsPsTools Suitenot foss: Windows command-line utilities

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Content Management

Web AppFeed2JS: Display RSS feeds on your own web page
Add-onMingle Forum: Wordpress add-on for bulletin board
Web AppphpBB: Bulletin board
Web AppphpGraphy: Photo gallery
Web AppWordPress: Blogging application and content management system

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E-mail and Calendaring

Add-ongContactSync: Mozilla add-on for Google contacts
Add-ongoogle-addressbook: Roundcube add-on for Google contacts
AndroidK-9 Mail: Email client for Android
Add-onLightning: Mozilla add-on for calendaring
LinuxMacOSXWindowsMozilla Thunderbird: Email/news client
Add-onProvider for Google Calendar: Mozilla add-on for Google Calendar
Web AppRoundCube: Webmail client; and Plugins
Web AppWebCalendar: Calendaring application

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Games

AndroidLinuxMacOSXWindowsBattle for Wesnoth: Turn-based strategy
LinuxMacOSXWindowsDolphin Emulator: Nintendo GameCube and Wii emulator
LinuxMacOSXWindowsFrogatto & Friends: 2D platformer
LinuxMacOSXWindowsFrozen Bubble: Based on Puzzle Bobble
AndroidHappy Chicknot foss: MAME, GBA, GBC, SNES, NES, MD, PS1 etc simulator game for Android
LinuxMacOSXWindowsMednafen: Multi game system emulator
LinuxMacOSXWindowsMegaZeux: Game creation system
LinuxWindowsPioneers: Based on Settlers of Catan
WindowsProject64not foss: Nintendo64 emulator
LinuxMacOSXWindowsSecret Maryo Chronicles: 2D platformer
LinuxMacOSXWindowsSuperTux: 2D platformer
LinuxMacOSXWindowsVega Strike: Space action simulation
AndroidLinuxMacOSXWindowsZSDX: Zelda fangame with Solarus
AndroidLinuxMacOSXWindowsZSXD: Zelda fangame with Solarus

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Geography

LinuxMacOSXWindowsMarble: Virtual globe, includes Earth, the Moon, Venus, Mars and other planets

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Graphics and Viewers

WindowsA Ruler For Windowsnot foss: On-screen pixel ruler
LinuxMacOSXWindowsGIMP: Raster graphics editor
LinuxMacOSXWindowsPDF Split and Merge: Merge and split pdf documents
WindowsPDFCreator: Create PDFs in Windows
MacOSXSeashore: Raster graphics editor

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Ham Radio

WindowsAGW Packet Enginenot foss: Packet radio modem
AndroidAPRSdroid: APRS for Android
LinuxMacOSXAprx: Terminal-based APRS iGate and Digipeater
LinuxMacOSXWindowsCHIRP: Tool for programming amateur radios
AndroidWindowsEchoLinknot foss: VoIP for amateur radio
MacOSXEchoMac: EchoLink client
LinuxMacOSXWindowsFldigi: Modem program for digital modes
LinuxGtkMMorse: Morse code learning tool
LinuxMacOSXWindowsHamlib: Ham radio control libraries
LinuxMacOSXWindowsJMorseTrainer: Morse code learning tool
WindowsJT65-HF: Weak signal digital mode
WindowsJust Learn Morse Codenot foss: Morse code learning tool
AndroidPocket RXTXnot foss: Android ham rig remote control
LinuxQSSTV: SSTV and FAX
LinuxQtel: EchoLink client
LinuxSoundmodem: Packet radio modem; Can be used with Xastir
LinuxSvxLink: Voice services for transceivers, including EchoLink and Voice Mail
LinuxXastir: APRS client

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Language and Literature

LinuxWindowsArtha: English thesaurus
LinuxMacOSXWindowsBibleTime: Bible study tool
AndroidBibleTime Mini
LinuxMacOSXWindowsCalibre: E-book library management application
AndroidLinuxMacOSXWindowsFBReader: e-Book reader

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Multimedia

LinuxMacOSXWindowsAudacity: Audio editor
LinuxMacOSXWindowsHandBrake: Video transcodor
LinuxK3b: CD/DVD burning application
LinuxK9Copy: DVD backup and authoring
AndroidLinuxMacOSXWindowsKodi Entertainment Center: 10-foot user interface media player
LinuxMacOSXWindowsStreamripper: Records streaming mp3 to your hard drive
AndroidLinuxMacOSXWindowsSubsonic: Streaming media server and apps
AndroidLinuxMacOSXWindowsVLC Media Player: Multimedia player, encoder, and streamer

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Music Composition

LinuxMacOSXWindowsMuseScore: Music notation program

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Office Suite

LinuxMacOSXWindowsLibreOffice: Office application suite

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Operating Systems

Android: Linux based mobile operating system
Android-x86: Port of Android to x86 platform
Chromium OS: Linux distribution designed for web apps
DD-WRT: Router firmware
Google Chrome OSnot foss: Linux distribution designed for web apps
openSUSE: Linux distribution
OSMC: Linux distribution with XBMC for Raspberry Pi
Raspbian: Debian optimized for the Raspberry Pi
Tomato USB: Router firmware

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Programming: Automation

WindowsAutoItnot foss: Windows GUI Automation
LinuxMacOSXWindowsSelenium: Automated software testing framework for web applications
LinuxMacOSXWindowsSoapUI: Web service testing application

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Programming: Editors and IDEs

Web AppCodiad: Web-based IDE
LinuxMacOSXWindowsDoxygen: Documentation generator
LinuxMacOSXWindowsEclipse: Software development environment
Add-oneclox: Eclipse add-on for Doxygen
Add-onEPIC: Eclipse add-on for Perl
LinuxMacOSXWindowsJoe: Terminal-based text editor
LinuxMacOSXWindowsKate: Text editor
LinuxKDevelop: Software development environment
WindowsNotepad++: Text and source code editor for Windows
LinuxMacOSXWindowsUmbrello: UML modeller

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Programming: Languages

LinuxMacOSXWindowsGCC: Compiler system
WindowsMinGW: GCC for Windows
LinuxMacOSXWindowsMySQL: Relational database management system
LinuxOpenJDK: Programming language
LinuxMacOSXPerl: Programming language
LinuxMacOSXWindowsPHP: Scripting language for web development
WindowsStrawberry Perl: Perl for Windows

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Programming: MathStat

LinuxWindowsCantor: GUI frontend for R, Maxima, Octave, and others
LinuxMacOSXWindowsGNU Octave: Numerical computations
LinuxMacOSXWindowsMaxima: Computer algebra system
LinuxMacOSXWindowsR: Statistical computing and graphics
MacOSXWindowsWabbitemu: Z80 TI calculator emulator
LinuxMacOSXWindowswxMaxima: GUI frontend for Maxima
LinuxwxWabbitemu: Wabbitemu fork for Linux

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Remote: Clients

AndroidConnectBot: SSH client for the Android
LinuxMacOSXCurlFtpFS: Mount FTP servers to folders
AndroidES File Explorernot foss: File manager for Android
LinuxMacOSXWindowsFileZilla: FTP, SFTP, and FTPS client
LinuxKRDC: VNC/RDP client
AndroidLinuxMacOSXOpenConnect: Cisco AnyConnect SSL VPN client
Windowsopenconnect-gui: GUI frontend for OpenConnect
LinuxWindowsPuTTY: SSH, telnet, rlogin, and raw TCP client
LinuxMacOSXWindowsqBittorrent: BitTorrent client
AndroidRealVNC Viewer for Androidnot foss: VNC viewer
Chrome OSRealVNC Viewer for Chromenot foss: VNC viewer
AndroidRemoternot foss: Android RDP client
Chrome OSSecure Shell for Chrome: SSH client for Chrome
WindowsSFTP Net Drive Freenot foss: Mount SFTP servers to drive letters
LinuxMacOSXSSH Filesystem: Mount SFTP servers to folders
LinuxMacOSXvpnc: Cisco VPN client
WindowsVPNC Front End: GUI frontend for vpnc

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Remote: Servers

LinuxMacOSXWindowsApache HTTP Server: Web server
WindowsFileZilla Server: FTP and FTPS server
LinuxMacOSXWindowsSynergy: Keyboard/mouse sharing
LinuxWindowsTigerVNC: VNC remote desktop server and client
LinuxWindowsTightVNC: VNC remote desktop server and client
MacOSXVine Server: VNC remote desktop server

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Virtualization

LinuxMacOSXWindowsVirtualBox: x86 virtualization software

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Web Browsers and Add-ons

Add-onAndroidAdblock Plus: Mozilla and Chrome/Chromium add-on for ad blocking; Use with EasyList
LinuxChromium: WebKit web browser
Add-onFlashGot: Mozilla browser add-on for download managers
AndroidChrome OSLinuxMacOSXWindowsGoogle Chromenot foss: WebKit web browser
AndroidLinuxMacOSXWindowsMozilla Firefox: Gecko web browser
Add-onNoSquint: Firefox add-on for zoom buttons
Add-onSynoLoader: Firefox add-on for Synology
Add-onSynology Download Station Extensionnot foss: Chrome/Chromium add-on for Synology
Add-onUser Agent Overrider: Firefox add-on for user agents
Add-onUser-Agent Switcher for Chromenot foss: Chrome/Chromium add-on for user agents

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Windows Support

WindowsBattle Encoder Shirase: Throttles CPU-hungry applications
LinuxMacOSXWindowsDOSBox: MS-DOS emulator
WindowsDual Monitor Tools: Tools for multiple monitor setups
WindowsPassPort: Port forwarding utility for Windows
WindowsVirtual CloneDrivenot foss: Mount disk images to drive letters
WindowsWinbolic Linknot foss: Symbolic links for Windows
LinuxMacOSXWine: Compatibility layer for running Windows software
WindowsWinMerge: Differencing and merging tool for Windows
WindowsXming: X server for Windows