OmniGraffle: http://www.omnigroup.com/

• arc_bits: Utilities for drawing individual arcs
• radio: Utilities for drawing radio phenomena (e.g., radio waves)

OmniGraffle scripts belong in ~/Library/Scripts/Applications/OmniGraffle. The easiest way to install these scripts after cloning the og-cs repository is:

$ mkdir -p ~/Library/Scripts/Applications/OmniGraffle
$ cd ~/Library/Scripts/Applications/OmniGraffle
$ ln -s /path/to/og-cs .

Then make sure you see the script menu in the menu bar when you're in OmniGraffle. If you don't see it, open the AppleScript Editor and enable it (Script Editor / Preferences / Show Script menu in menu bar).