rxvt-unicode is a clone of the well known terminal emulator rxvt, modified to store text in Unicode and to use locale-correct input and output. It also supports mixing multiple fonts at the same time, including Xft fonts, real transparency, and an optional embedded Perl interpreter that allows you to extend your terminal easily.
Opcion Font Viewer is a Java application that allows you to view both installed and uninstalled TrueType fonts on Windows, Linux, Unix, or Mac OS. Unlike the default font viewers supplied with most operating systems, it allows you to view many fonts at a time, giving you the power to set the sample text shown and font style. This makes it easy to choose the best font to use for graphics and multimedia project.
The DejaVu fonts are a font family based on the Bitstream Vera Fonts. Its purpose is to provide a wider range of characters while maintaining the original look and feel. The family is available as TrueType fonts and also as third-party packages for various operating systems, including handhelds.