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Qt is an open source cross-platform application and UI framework for developers using  C++ (see more).
I compiled Qt 4.8.5 and adapted some simple applications for GCW Zero.

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Applications

LightMaps is an OpenStreetMap viewer from QT4 SDK.
--- Wi-Fi Internet connection required ---

       
        Controls:
        - Move: D-pad
        - Zoom in: "Right shoulder"
        - Zoom out: "Left shoulder"
        - Menu: "B" button
        - Activate menu item: "Start" button
        - Exit: "Select" button

        Download opk:  lightmaps.opk 6.5 MB
        Source:              lightmaps-gcw0-src.tar.gz

Anomaly is a simple web-browser for embedded system from QT4 SDK.
--- Wi-Fi Internet connection required ---

       
        Controls:
        - Move: Mouse mode (Power+B)
        - Exit: "Select" button
        - Onscreen keyboard is not implemented.

        Download opk:  anomaly.opk 14.8 MB
        Source:               anomaly-gcw0-src.tar.gz

Calculator is a simple application from QT4 SDK.

       
        Controls:
        - Select buttons: D-pad
        - Push button: "Y" button
        - Clean: "Left shoulder"
        - Backspace: "Right shoulder"
        - Equal: "Start" button
        - Exit: "Select" button

        Download opk: calculator-qt.opk 7 MB
        Source:              calculator-qt-gcw0-src.tar.gz and inside .opk

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Games

Battleship is a simple sidescrolling arcade game from qt-apps.org.

       
        Controls:
        - Move: D-pad
        - Shoot: Y button
        - Pause: Right shoulder
        - Exit: Select

        Download opk:  battleship.opk 7.8 MB
        Source:               battleship-gcw0-src.tar.gz


PortedAsteroids is a port of Asteroids game from QT4 SDK.

       
        Controls:
        - Thrust: D-pad up
        - Brake: D-pad down (item needed)
        - Rotate left: D-pad left
        - Rotate right: D-pad right
        - Shoot: Y button
        - Shield: X button
        - Teleport: B button
        - Launch: A button
        - New game: START button
        - Exit: SELECT button

        Download opk:  portedasteroids.opk 6.5 MB
        Source:               portedasteroids-gcw0.src.tar.gz

OPK-version of applications includes all necessary shared libs.  You can unpack opk file for access to binaries:
$ unsquashfs -d /tmp/tempdir *.opkThen use a *.dge shell script to launch app.

Next archive contains Qt libraries for GCW0 separately: qt4-gcw0.tar.gz (19.6 MB).

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All Qt's things for developers:
        qt-4.8.5-gcw0.tar.gz

To build Qt I used custom toolchain with IPV6 support (added BR2_TOOLCHAIN_BUILDROOT_INET_IPV6=y into buildroot config) and qt-pthread patch (many thanks for EXL's tutorial!).
Configure options:
./configure -embedded mips -opensource -confirm-license -little-endian -host-little-endian -qt-mouse-tslib -qt-mouse-linuxinput -opengl es2 -qt-gfx-transformed -qt-gfx-vnc -qt-zlib -qt-libtiff -qt-libpng -qt-libmng -qt-libjpeg -nomake docs -fast -prefix /opt/QtSDKs/Qt4.8.5-mips-gcw0-new
Supported features:
+ Core, widgets, network etc works fine
+ QML/Javascript and webkit works fine
+/- OpenGL ES works only for 2D grafic
- Phonon and some other multimedia features requires glibc and gstreamer support.

Edit 2019-02-07: fixed links, removed static-version stuff, spell-checked

Unfortunately static linking disables the WebKit, so I recommend using a dynamic version.

Anyway you can try this Anomaly OPK(14.8 MB), which includes all necessary libraries.

Two of us! And my TV is so old that I can't plug TV-out on it! 

Edit: The browser seems to be broken. The mouse does not work as well as the keyboard doesn't seem to be an option...

Did you activate the mouse input mode (Power+B)?
Anyway without onscreen keyboard browser isn't very useful.

Compiling statically is not a good idea. What you could do instead, is put the dynamic Qt libs in the OPK in a directory named libs/ and use the following script:

Thanks, I already did that for webkit app.
Could you tell me, what are the advantages of dynamic linking to the static? Static OPK is a bit smaller than the dynamic + library. Is a few large files better than one very large executable?

Moreover, static linking can violate licenses of certain software. In example, you can't statically link against GPL licensed libraries for close-source projects.

I tried Power+B, but still no mouse movement...

This is supposed to work with circlepad right?

No, Power+B works with the D-PAD.

Moreover, static linking can violate licenses of certain software. In example, you can't statically link against GPL licensed libraries for close-source projects.

And you can't dynamically link GPL libraries either, I suppose you meant LGPL.
The LGPL allows you to link statically a closed-source binary to LGPL libraries, as long as you redistribute the object files.

Any progress with web browser?

Now there's nothing for release, sorry.

I get errors about a missing qmake.conf in /opt/QtSDKs/Qt4.8.5-mips-gcw0-new/mkspecs/default. The directory is empty on my computer. Should something be there, or is there a specific mkspec i need to use?

mkspecs/default should be a link to qws/linux-mips-g++.
ls -l /opt/QtSDKs/Qt4.8.5-mips-gcw0-new/mkspecs/default
/opt/QtSDKs/Qt4.8.5-mips-gcw0-new/mkspecs/default -> qws/linux-mips-g++
Please remove empty mkspecs/default  folder and create a link.
cd /opt/QtSDKs/Qt4.8.5-mips-gcw0-new/mkspecs
rm -r default
ln -s qws/linux-mips-g++ default
I updated qt-4.8.5-gcw0.tar.gz  archive. Thanks for the report.