I have many projects. Below is an incomplete list of them. You can find other goodies on my GitHub page.
An extensible markup previewer, capable of showing texts written in multiple markup languages.
An Android application to track your protein consumption. Primarily designed to help people affected by Phenylketonuria.
An image viewer for KDE. It is the default image viewer since KDE 4.0. After maintaining it for 14 years, I passed maintainership To Lukas Tinkl.
A kid-friendly media player.
A graphical search and replace utility.
An alternative to KDE Plasma 4 notifications. I am reasonably happy with Plasma 5 notifications, so I don't have plans to port Colibri to Plasma 5 for now.
Command line tools
A command-line-based, sqlite-powered TODO list.
A Doxygen input filter to document QML files.
An Android game where you must prepare burgers fast enough to keep your customers happy.
A PC and Android game. Race with tiny pixel-art vehicles on various maps.
A top-down Amiga game I wrote when I was a teenager. It features 2 or 3 players sittings on floats in the sea, trying to sink each others by throwing sea urchins.