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.
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.