Part of [megapkg] and available from http://code.google.com/p/megapkg/ 

Freetypeext is an extension that generates [megaimage] buffers using [FreeType] from TTF fonts.  Other font types may work, but are untested.  Antialias alpha blending is provided by using megaimage's blendobj subcommand.

License: 3 clause BSD (see the website)

Usage (assuming the user runs the install target):
 $ tclsh8.5 
 % package require freetypeext
 1.0
 % freetype
 wrong # args: should be "freetype font size text RGBA-color widthvar heightvar ?char-width-listvar?"
 % freetype-measure
 wrong # args: should be "freetype-measure font size text widthvar heightvar" 

 set buf [freetype /path/to/font.ttf 12 "Hello World" [list $r $g $b $a] width height]

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[Category Package]