You can download binaries (latest version only):
redhat9/FC3, Win2K/XP,
OSX,
IRIX,
FreeBSD
You can easily make copies of the ruler and reoriented it via either the keyboard or mouse:
Keyboard:
'c' -- make a copy of the current ruler (in focus)
'esc' -- closes current ruler (in focus)
'q' -- quit all rulers
Up,Down,Left,Right -- re-orients ruler (arrow points to where zero will be)
Mouse:
Left-Drag -- drags current ruler around for positioning
Left-Double-click -- reverses direction of current ruler's numbers
Left-Triple-click -- rotates current ruler 90 degrees
Middle-Click -- makes copy of current ruler