Silhouette graphics art software for Mac instantly converts black and white or colour bitmap images into vector designs ready for use. Silhouette is available as standalone application and as plugin for Adobe Illustrator.
Information from the developer's website: (link)
Silhouette graphics art software for Macintosh and Windows instantly converts black and white or colour bitmap images into vector designs ready for use.
Minimum system requirements for Stand-Alone version:
• Any Apple Power Macintosh
• Runs on Macintosh OS-8/9/X
• Carbon Classic version: Mac OS 8.5 - 9.2
• Mac OS X version: Mac OS X 10.0 - 10.4 (not running under Mac OS X 10.5 Leopard and higher)
Minimum system requirements for Adobe Illustrator Plug-in version:
• Compatible with Adobe Illustrator 8, 9, 10, CS, CS2 & CS3
• Runs on Macintosh OS-8/9/X
• Runs on Windows 98/Millenium/NT/2000/XP
(source: Link)