...Compile your games into stand-alone .NET executables or customizable C# source code. The IDE and framework are build on OpenTK, which wraps OpenGL, so generated games can be cross-platform.
AprilBrush is a Qt-based application for digital painting with support for layers, brush libraries and multi-page, written in C++/JavaScript/QML languages. The program saves the image files in the format OpenRaster and can also export them to PNG. Required a pressure sentive input device (graphic tablet).
Source code can be find in a git repository:
https://github.com/krre/AprilBrush-Desktop
A panographic toolkit compliant with open source standards
pano3 (or "pano cube") is an experimental, cross-platform, open source toolkit designed to agree with modern web standards such as HTML5, CSS3 and CSS3D. The pano3 viewer is now released as a jQuery plug-in based on 3d transformations supported by CSS3D. The desktop utilities are written in Java 1.7.