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Contribute
Translate
Translate the source code of Xfce.
Documentation
How to start writing or translate the application manuals on this website.
Bugs
All there is to know about properly reporting bugs in the bug tracker.
Development
How to contribute code and becoming a developer.
Bountysource
To support the Xfce project or making it more attractive to get things done, you can back the project with bounties on bugs or leave it up to the developers to decide what to do.
API documentation
Library references can be found in the releases: garcon, exo, libxfce4ui, libxfce4util, thunar, xfconf. They are often also installed by distributions in /usr/share/gtk-doc/html/.
Additionally, Xfce uses the GTK+/Glib family of libraries which can be found at the following:
Tutorials for getting started with GTK+ are available at:
If you're looking at writing a panel plugin, you may want to look at the xfce4-sample-plugin for an easy start.