Coda http://www.panic.com/coda/

• .sass

git clone (or download and copy) "Sass.mode" folder to "~/Library/Application Support/Coda/Modes"

• Create folder(s) if needed.
• You might need to rename the folder to "Sass.mode" (downloaded from source)
• In the Alternate INSTALL, you'll need to do a "Show Package Content" on the "Coda" Application.

• http://upstruct.svn.beanstalkapp.com/sass/ (Author: Tom-Marius Olsen)
• http://github.com/Brajeshwar/Sass.mode
• https://github.com/ry5n/ry5n-sass.mode

More about Mode Customization: http://www.codingmonkeys.de/subethaedit/mode.html