libfolks is a library that aggregates people from multiple sources (e.g. Telepathy connection managers and eventually evolution-data-server, Facebook, etc.) to create meta-contacts. It's written in Vala.
A simple encrypted diary keeper, allowing the editing of diary entries for each day, as well as the addition of "links" to other content (such as web pages and files) to entries. Other features include spell checking, printing and basic statistics for the diary.
libgdata is a GLib-based library for accessing online service APIs using the GData protocol — most notably, Google's services. It provides APIs to access the common Google services, and has full asynchronous support.
uhttpmock is a project for mocking web service APIs which use HTTP or HTTPS via libsoup. It provides a library, libuhttpmock, which implements recording and playback of HTTP request–response traces.
See the test programs in libuhttpmock/tests/ for simple examples of how to use the code.
libuhttpmock’s API is currently unstable and is likely to change wildly. [Less]
Bendy Bus is a system to mock up parts of D-Bus server–client systems in order to test the other parts.
It allows fuzz and unit testing of D-Bus clients by simulating the corresponding D-Bus servers. Simulations are written in a simple FSM-based language.
gnome-directory-thumbnailer is a GNOME thumbnailer utility which will generate a thumbnail for a directory. It is intended to be called by gnome-desktop’s thumbnailer code, but can be called manually as well.