I have many projects. Below is an incomplete list of them. You can find other goodies on my GitHub page.
An image viewer for KDE. It is the default image viewer since KDE 4.0.
A command-line-based, sqlite-powered TODO list.
An alternative to KDE Plasma notifications.
A kid-friendly media player.
A graphical search and replace utility.
A Doxygen input filter to document QML files.
An extensible markup previewer, capable of showing texts written in multiple markup languages.
An Android game where you must prepare burgers fast enough to keep your customers happy.
A top-down Amiga game featuring 2 or 3 players in the sea, sittings on floats, trying to sink each others by throwing sea urchins.