Windows TrueType Barcode Font Library  
   TrueType barcode fonts
   http://www.hallogram.com/barcodes/bcfonts/

Bar Codes from Bitstream Inc.  
   A collection of bar code fonts available for both TrueType and PostScript Type 1 formats, for Windows and Macintosh operating systems.
   http://www.bitstream.com/categories/products/fonts/barcode/index.html

BarcodeONE  
   Florida company offers barcode fonts including code 39, UPC and PostNet.
   http://www.barcodeone.com/

BizFonts.com  
   Bar code fonts including Code 39, Code 128, EAN and UPC. High density barcode fonts such as PDF417 and DataMatrix are also available. Free downloads.
   http://www.bizfonts.com/

Barcode Fonts  
   Extensive listing of free and trial version barcode fonts in TrueType and PostScript formats.
   http://cgm.cs.mcgill.ca/~luc/barcode.html

Azalea Software Inc.  
   Publishes bar code software that creates Code 39, PDF 417, Code 128, UPC, EAN, Interleaved 2 of 5, and other barcode symbols. Bar code fonts work under Microsoft Windows, Macintosh, UNIX, and other platforms.
   http://www.azalea.com/

TrueType Barcode Font Pack  
   Offers executable files for installing TrueType versions of Code 39, Extended Code 39, Code 128, UPC-EAN, Interleaved 2 of 5, Postnet, Planet, MICR E-13B, OCR-A, OCR-B and EZ Barcode font packages.
   http://www.bizfonts.com/fontpackage/

I Shot the Serif - Free 3 of 9  
   Completely free Code 39 font includes all ASCII characters.
   http://www.squaregear.net/fonts/free3of9.shtml

Carolina Barcode  
   Code 2 of 5 Primer and Extended Code 3 of 9 fonts for Macintosh or TrueType format. Demo available.
   http://www.carolinabarcode.com/

Morovia Corporation  
   Monterey Barcode Creator support all major barcode formats, including UPC, EAN, code 39 and even Postnet barcodes. Code 39 font is completely free.
   http://morovia.com/

BarFonts  
   Collection of PostScript Type 1 fonts for printing bar codes, available under the GNU General Public License. The fonts consist of bars only, there is no human readable text along with the bars.
   http://user.it.uu.se/~jan/barfonts/