GNU TeXmacs is a free wysiwyw (what you see is what you want) editing platform with special features for scientists. The software aims to provide a unified and user friendly framework for editing structured documents with different types of content: text, mathematics, graphics, interactive content. TeXmacs can also be used as an interface to many external systems for computer algebra, numerical analysis, and statistics. New presentation styles can be written by the user and new features can be added to the editor using Scheme.
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.
5x9 and 5x10 are two X11 fonts intended for use with xterm or other programs requiring readable small fonts. At only 5 pixels wide, they are particularly well suited to small laptop screens, allowing two 80 column windows side by side on an 800x600 screen (albeit with no room for window frames), or three windows across with room to spare on a 1280x1024 screen. The fonts implement VT100 line-drawing characters. Bolding is not directly supported; xterm does adequate bolding by duplicating pixels.