libcaca is a software library that converts images into colored ASCII art. It includes the library itself, and several programs including cacaview, an image viewer that works inside a terminal emulator, and img2txt, which can convert an image to other text-based formats.
libcaca has been used in a variety of programs, including FFmpeg, VLC media player, and MPlayer.
libcaca is free software, licensed under WTFPL version 2.