robust, modular log coloriser

ccze

robust, modular log coloriser

CCZE is a robust and modular log coloriser, with plugins for apm, exim, fetchmail, httpd, postfix, procmail, squid, syslog, ulogd, vsftpd, xferlog and more.
EXAMPLE from man - 2

cdlabelgen

generates front cards and tray cards for CDs and DVDs

cdlabelgen was designed to simplify the process of generating labels for CDs and DVDs. It originated as a program to allow auto generation of front cards and tray cards for CDs burned via an automated mechanism (specifically for archiving data), but has now become popular for labelling CD compilations of mp3's, and copies of CDs. Note that cdlabelgen does not actually print anything--it just spits out postscript, which you can then do with as you please.
Cecilia5 - BeatMaker module

cecilia

Sound synthesis and audio signal processing environment

Cecilia is an audio signal processing environment aimed at sound designers. It lets you create your own GUI using a simple syntax and comes with many original built-in modules and presets for sound effects and synthesis.
real-time visual space simulation

celestia

real-time visual space simulation

real-time visual space simulation (GNOME frontend)

celestia-gnome

real-time visual space simulation (GNOME frontend)

Vector graphics tool for GNUstep

cenon.app

Vector graphics tool for GNUstep

Cenon is a graphical tool of a special kind. Build upon a modular graphical core, Cenon offers a wide variety of possibilities and applications - not only Desktop Publishing. The best of all, Cenon is free software, available with full source codes, and at home on many computer platforms.