I'm working in control, my last (and probably most ambitious?) project.

It is a X11 widget toolkit (or widget set) for writing GUI programs.
Currently it only provides a single widget, the text input field, where you can edit a single line of text.
However, this widget is very powerful and has lots of editing features any user expects from an input field: Ctrl-Z (undo/redo), mouse selection, Emacs-like text-editing keybindings, etc.

In the future, I'll expand this widget set with more widgets, and write some actually useful applications with it.