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][1])

Silhouette graphics art software for Macintosh and Windows 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?.

Why buy Silhouette the vectorization software?
? quick and user-friendly.
? recovers perfectly logos, pictures of bad quality (scan, fax..)
? compatible with Illustrator, Indesign, FreeHand, Flash, Photoshop,
Corel Draw, ...
? easier to use and better results than other solutions.
? helps you at every stage.
? frequent updates.
? professional tools for DTP, CAD, 3D, prepress, web, multimedia,
screen-printing, ?
? uniques correction tools.
? compatible with OS-8.5 or higher, Mac OS-X and Windows.

Available as plugin for Adobe Illustrator running on Macintosh and
Windows!
Silhouette is now available as plugin for Adobe Illustrator? 8, 9, 10,
CS, CS2 & CS3.

Unique features:
? vectorizes colors and b&w images/logos.
? straightens up a logo that was badly oriented in the scanner.
? sharpens rounded or truncated corners.
? deletes useless points.
? converts flat curves into straight lines.
? aligns segments of straight lines on the same axis.
? smoothes curves.
? simplifies curves while keeping their appearance.
? converts to Illustrator, EPS, Flash or DXF file-format.
? batch vectorization.

How I have improved the quality of my documents and my productivity!
Its specific vectorized image correction tools allow you to right a
logo so it is perfectly horizontal, to sharp rounded or truncated
corners, to suppress unnecessary points, to convert "flat curves" into
straight lines, to align segments on the same axis, to smooth tangents
and to remove unnecessary points in curves whilst retaining their
shape.

Features list:

Silhouette Pro Available for Macintosh only
? Vectorization of all or part of an image
? Colours and b&w vectorization
? Batch vectorization
? Automatic/manual colours extraction
? Photo masking
? Vectorization in horizontal stripes
? Pen tool
? Adds/suppresses points
? Measuring tool
? Aligns / distributes paths
? Rotates, enlarges, applies a symmetry, ?
? Rights a logo that was badly oriented in the scanner
? Sharpens rounded or truncated corners
? Aligns segments of straight lines on the same axis
? Deletes useless points
? Converts flat curves into straight lines
? Smoothes curves
? Simplifies curves while keeping their appearance
? Colours palette
? Selection by colours
? Imports QuickTime, QuickDraw PICT, MacPaint, Photoshop (v 2.5 and
3.0 ), Silicon Graphics, GIF, JFIF/JPEG, QuickDraw GX, BMP, PNG, TGA,
TIFF, FlashPix
? Exports Adobe Illustrator, Flash, DXF
? Prints on desktop printer

Silhouette Lite
Silhouette is also available in Lite version. It vectorizes b&w images
only, no correction tools, no batch vectorization, no DXF and Flash
export.

Silhouette plugin for Adobe Illustrator Available for Macintosh and
Windows
? Vectorization of all or part of an image
? Colours and b&w vectorization
? Automatic/manual colours extraction
? Photo masking
? Rights up a logo that was badly oriented in the scanner
? Sharpens rounded or truncated corners
? Aligns segments of straight lines on the same axis
? Deletes useless points
? Smoothes curves
? Simplifies curves while keeping their appearance
? Interactive preview window
? Online help

The Manual link supplies the Technical Sheet.

First Download link is archive with all the files I could save from
the original developer's website ([download webpage][2], [News
webpage][3], [MacUpdate website][4], [video demonstration webpage][5])
via Wayback Machine.
It contains all listed files but the Plug-ins for Illustrator CS3 and
the PDF manuals
(missing files:
"SilhouetteBeta1.zip" (Stand-Alone version for Mac OS X 10.5 Leopard),
"Silhouette_plugin-EN_CS3.zip", "Silhouette_plugin-FR_CS3.zip",
"Silhouette_plugin-IT_CS3.zip", "SilhouettePlugInCS3.zip" (Plug-ins
for Illustrator CS3),
"Handbook_Silhouette_EN.pdf", "Handbook_Silhouette_FR.pdf",
"SilhouetteAiuto.pdf", "helpSilhouette.pdf", "SilhouetteAiuto.pdf"
(PDF Manuals for Stand-Alone version and Plug-ins))

Second Download link is archive with all the newer Stand-Alone version
v1.9.4 from 2005 in English and French language versions, which is
compatible with Mac OS X 10.5, I could save from [here][6].

Later on, there was produced a stand-alone version for Mac OS X 10.5
Leopard and later and a version of the plug-in for use in Illustrator
CS4 and later [link][7]. Please upload these if you can find them!

Here is a [review][8] of the Illustrator Plug-in v1.0.1.

Compatibility
Architecture: PPC (Carbonized)

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 Mac OS 8/9/X
? Runs on Windows 98/Millennium/NT/2000/XP

(source: [Link][9])

  [1]: http://web.archive.org/web/20080302200024/http://www.silhouetteonline.com/
  [2]: http://web.archive.org/web/20080913215302/http://www.silhouetteonline.com/silhouette/download.php3
  [3]: http://web.archive.org/web/20080820034855/http://www.silhouetteonline.com/silhouette/review.php3
  [4]: https://www.macupdate.com/app/mac/9694/silhouette-standalone
  [5]: http://web.archive.org/web/20071011023713/http://www.silhouetteonline.com/silhouette/video.php3
  [6]: http://telecharger.caloga.com/viewsoft.php3?key=00209040050&uid=8gugyl666a5571ed4
  [7]: http://web.archive.org/web/20100110041758/http://www.silhouetteonline.com/
  [8]: http://illustrator.digitalmedianet.com/article/Free-Soft-Silhouette-101-16166
  [9]: http://web.archive.org/web/20080930231224/http://www.silhouetteonline.com/silhouette/vectorization.php3