A Windows Media Player enhanced with a guitar toolbox, playlist support, and several useful features. I had the opportunity to collaborate with Microsoft to test the then-new Desktop Bridge and help improve the developer experience.
http://www.microsoft.com/store/apps/9nm2x9m7gw9m
Sally Project is a smart touchscreen application that also supports mouse input. It's available as Freeware and Open Source. It features a custom API for application integration, a fully developed theming system, and multilingual support. Additionally, the popular adventure game engine SCUMM VM was successfully ported to run within Sally.
C++ DirectX WinAPI
I host several websites for friends, all built using my custom framework. Each site includes an admin area and is tailored to meet specific individual needs.
Examples:
https://www.der-knob.de
https://www.super-laser-freunde.de
https://www.feuerschmiede.com