FIGlet is a program for making large letters out of ordinary text. It prints its input using large characters made up of ordinary screen characters. FIGlet output is generally reminiscent of the sort of "signatures" many people like to put at the end of email and UseNet messages. It is also reminiscent of the output of some banner programs, although it is oriented normally, not sideways.
gbdfed is a GTK+-based BDF font editor. Multiple fonts can be loaded from the command line. Multiple fonts can be open at the same time. Cutting and pasting glyphs between fonts, font name and property editing, and built-in online help. It imports PK/GF, HBF, PSF, CP, Linux FNT, VFONT, OpenType/TrueType, and some FON/FNT fonts. It can export PSF2 fonts.
acoc is a regular-expression based colour formatter for programs that display output on the command-line. It works as a wrapper around the target program, executing it and capturing the stdout stream. Optionally, stderr can be redirected to stdout, so that it, too, can be manipulated. acoc then applies matching rules to patterns in the output and applies colours to those matches.