Bash_clock is a project mainly written in Shell, it's free.
A Bash Clock
/\ \ _| A Bash Clock | | | _/___/
Hours (H), Minutes(M) and Seconds(S).
Here's a "screenshot" at 10:48:28
HHHHHHH
HHHHHHMMMMMMMMMM HHHHHH MMMMMMMMMMM HHHHHH MMMMMMMMMMMHH MMMMM SS S SS SS S SS SS S S S