X-Unikey is a tool that lets you type Vietnamese in an X Window environment. It has been tested with many popular programs such as OpenOffice, emacs, vim, QT, and GTK applications. It has all the features of Unikey, the Windows version, except that its GUI is simplified. All options are set through configuration file or keyboard shortcuts.
GtkEveMon is a skill monitoring stand-alone application for GNU/Linux systems. It is written in C++ and uses GTK for the GUI. You can monitor your current skills and your skill training process without starting EVE-Online, but (of course) you still need a working Internet connection.