Cute Chess is a graphical user interface, command-line interface and a
library for playing chess. Cute Chess is written in C++ using the Qt
framework.

An implementation of the classic hearts card game for the GNOME desktop,
featuring configurable rulesets and editable computer opponents to satisfy
widely diverging playing styles.

Simon Tatham's Portable Puzzle Collection.

SGT Puzzle Launcher (sgt-launcher) is a GTK+ 3 launcher application for Simon
Tatham's Portable Puzzle Collection. The launcher embeds each game into it's
window and wraps game functionality into the UI to make for an improved
experience.

Draco is a library for compressing and decompressing 3D geometric meshes
and point clouds. It is intended to improve the storage and transmission of
3D graphics.

Draco was designed and built for compression efficiency and speed. The code
supports compressing points, connectivity information, texture coordinates,
color information, normals, and any other generic attributes associated
with geometry. With Draco, applications using 3D graphics can be
significantly smaller without compromising visual fidelity. For users, this
means apps can now be downloaded faster, 3D graphics in the browser can
load quicker, and VR and AR scenes can now be transmitted with a fraction
of the bandwidth and rendered quickly.

Draco is released as C++ source code that can be used to compress 3D
graphics as well as C++ and Javascript decoders for the encoded data.

F3D is a VTK-based 3D viewer following the KISS principle, so it is
minimalist, efficient, has no GUI, has simple interaction mechanisms and is
fully controllable using arguments in the command line.

Consistent look across all the apps and can run in lower system with
minimum dependencies. All the apps are based on QT toolkit and Desktop
Independent.

GNUstep provides a robust implementation of the AppKit and Foundation libraries
as well as the development tools available on Cocoa, including Gorm (the
InterfaceBuilder) and ProjectCenter (ProjectBuilder/Xcode).

Simple, cross-platform image viewer inspired by GPicView.
Features:
- Just a viewer, not an editor or organizer;
- Support a large number of image formats;
- Support an embedded ICC Profiles;
- Support EXIF, XMP and other metadata;
- Lightweight and fast;
- Very suitable for default image viewer of desktop system;
- Simple and intuitive interface;
- Cross platform: GNU/Linux, macOS, Windows, Haiku and other systems;
- Minimal external lib dependency: only pure Qt and system libraries are used;
- Flexible and configurable;
- Desktop independent: doesn't require any specific desktop environment;
- Open source, licensed under GNU GPL v3 or later;