Mathkaba, a small program for managing a library of electronic articles (like Mendeley, except that Mendeley is not specific to maths, closed-source, and has many more features). It is written in C++ using the Gtk toolkit (through gtkmm), and CMake as its build system.
Source code is available on GitHub.
VDeck, a viewer and editor for vCards. VDeck manages a directory filled with vCard files. It currently only supports vCard version 3.0 (RFC 2426), with one file per contact, and minimalistic editing. The project is hosted on GitHub. VDeck can be built on Windows using CMake GUI to generate a VS2008 Express project.
Here's a nice screenshot
Quelques programmes en Haskell: