This is a list of notable applications that use GTK and/or Clutter for their GUI widgets. Such applications blend well with desktop environments that are GTK-based as well, such as GNOME, Cinnamon, LXDE, MATE, Pantheon, Sugar, Xfce or ROX Desktop.

Official GNOME applications

The GNOME Project, i.e. all the people involved with the development of the GNOME desktop environment, is the biggest contributor to GTK, and the GNOME Core Applications as well as the GNOME Games employ the newest GUI widgets from the cutting-edge version of GTK and demonstrates their capabilities.

Shells, user interfaces, application launchers

• GNOME Shell – the desktop graphical GUI shell introduced with GNOME version 3.0
• Cinnamon fork of the GNOME Shell
• GNOME Panel and forks – applications launcher
• Maynard, a shell for Weston by Collabora originally for the Raspberry Pi
• Budgie is a distro-agnostic desktop environment

Education software

• Tux Typing – typing tutor for children
• DrGeo – geometry software
• GCompris – educational entertainment for children (legacy version only)

Utility software

Operating system administration

• Disk Usage Analyzer – Disk-usage analyzer
• GNOME Disks – utility for the hard disk; partition editor, S.M.A.R.T. monitoring, formerly known as Gnome Disk Utility or palimpsest
• GParted – utility for the hard disk; partition editor
• GDM – X display manager
• GNOME Keyring Manager – Password manager
• GNOME Screensaver – Simple screensaver configuration
• Alacarte – Menu editor

End-user utilities

• Archive Manager – archive manager
• Cheese – webcam application
• Conduit Synchronizer – Photo/music/notes/files etc. synchronization
• Eye of GNOME – official image-viewer for GNOME
• Getting Things GNOME! – Personal tasks management software
• gnee – A GNOME GUI and a panel applet that can be used to record and replay test cases.
• GNOME Boxes – Application to access remote or virtual systems
• GNOME Screenshot – take screenshots of desktop and windows
• GNOME Calculator – calculator
• GNOME Commander – Two-panel graphical file manager
• GNOME Files – File manager, formerly called Nautilus
• GNOME Terminal – Terminal emulator
• Gnote – Note-taking software in C++
• Guake – drop-down terminal emulator^[1][2]
• Gucharmap – Character map
• Guvcview – webcam application
• Orca – Scriptable screen-reader
• Scribes – Text editor
• Seahorse – PGP and SSH key-manager
• Sushi – File previewer
• Terminator - Terminal emulator
• Tilda – drop-down terminal emulator^[3][4][5][6]
• Tomboy – Note-taking software in C#
• Vinagre – VNC client
• Vino – VNC server (deprecated)

Games

• GNOME Games – collection of games in Vala and C, now archived
• Lutris - video game manager/launcher

Abstract strategy games

• GNOME Chess – new 2d graphical front-end written in Vala
• PyChess – Chess implementation

Puzzle games

• GNOME Mines – Minesweeper-clone
• gbrainy – Brain teaser game

Graphics

Graphics editors

• GIMP – an extensive raster graphics editor
• Inkscape – an extensive vector graphics editor
• MyPaint – an extensive raster graphics editor, for digital painters
• Pinta – a minimalist raster graphics editor

Image viewers

• Shotwell – Photo manager
• F-Spot – Photo manager
• gThumb – Image viewer

Internet software

Web browsers

• Web – default GNOME web-browser
• Midori – default Xfce web-browser
• Uzbl – minimalist web-browser
• xombrero – minimalist web-browser

Email clients

• Balsa – Email client
• Claws Mail
• Evolution (software)
• Geary
• Modest (email client)
• Pantheon Mail
• Sylpheed

Software for inter-person communication

• Empathy – instant-messaging client, VoIP and videoconferencing
• Pidgin – Instant messenger
• Smuxi – User-friendly IRC Client
• HexChat – IRC client
• Gajim – Instant messenger

File sharing

• Deluge — BitTorrent client
• Transmission – BitTorrent client
• Gwget – Download manager framework
• Gwibber – Microblogging client
• Liferea – RSS feed reader
• Pan – Usenet news reader

Office software

• AbiWord – word processor
• GnuCash – Personal and small business finance manager
• Gnumeric – Spreadsheet
• BOND – Database frontend
• Evince – pdf viewer
• GNOME Dictionary – Dictionary
• Evolution – Integrated mail, contacts, and calendar
• OCRFeeder – a graphical front-end for the Optical character recognition engines CuneiForm, GOCR, Ocrad and Tesseract

Tools for programming and development

• GNOME Builder – Integrated development environment
• Anjuta – Integrated development environment
• Glade Interface Designer – a Graphical user interface builder
• Gedit – Text editor
• Leafpad – Lightweight text editor
• Lazarus - cross-platform visual IDE for RAD using the Free Pascal compiler
• Devhelp – API documentation browser
• Nemiver – C and C++ debugger
• Geany – text editor suitable for programming
• Meld – diff-viewer
• PIDA – IDE
• Xojo – IDE
• Zenity – execute GTK dialog boxes from shell scripts
• Bluefish – Web design editor
• MonoDevelop – Integrated development environment
• ActiveState Komodo – Integrated development environment
• Gtranslator – uses gettext
• poedit – gettext
• Scala (software)

Optical disc software

Optical disc authoring software

• Brasero – optical disc authoring software, graphical front-end to burn CDs/DVDs

Optical disc ripping software

• Grip – CD ripper and player
• Thoggen – DVD backup utility

Audio

• Software audio players (free and open-source)
• SoundConverter (software)
• GNOME Sound Juicer

Video

Video players

• GNOME Videos – the GNOME default video player

Video editors

• Gnome Subtitles – Video subtitling
• Pitivi – Video editor
• Cinelerra - Video editor

Science software

Chemistry

Despite the immense popularity of Qt, there continues to be science software using the GUI widgets of version 2 of GTK toolkit. Whether this is going to remain that way, or whether the software will be ported to some current version of GTK (maybe GTK 4) remains to be seen.

• Ghemical – computational chemistry software package

Statistics

• gretl — an open-source statistical package, mainly for econometrics

Various

• Beagle – search tool
• Gramps – Genealogy software