The Bar Code FAQ
[http://www.azalea.com/FAQ.html]
has valuable information, and is now available in PDF or as HTML. There are lots of other related barcode whitepapers there too. 

BarCode1 FAQ
[http://www.adams1.com/pub/russadam/faq.html]
is an entirely different document.

A valuable tool in barcode work is the "Barcode Server"
[http://www.milk.com/barcode/].  "Lighten your keychain"
[http://www.diymods.com/archives/2005/11/feature_lighten.cfm]
provides perspective on manipulations feasible with barcodes.



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ZZZ
[http://www.linuxcanada.com/files/linuxpos_start1.2.10.pdf]
is a point-of-sale application coded in Tcl.


Archiver
[http://www.narrabri.atnf.csiro.au/software_dev/archiving_station/archiver.html]
is an archival application written in Tcl.



One CueCat decoder
[http://www.logorrhea.com/cuecat/]
is written in Tcl.


"A fully automated high-throughput HPLC-MS system ..."
is an academic article which describes a Tcl-coded
biochemical system which employs barcodes.

Mads Linden writes,
"i dont know if this will help you, but what i did
was to download a 3of9 barcode font to my system and then just using
that font when sending data to the printer extension from michael swartz.

get the font here:
http://www.adams1.com/pub/russadam/fonts.html
ex.
    gdi text $hdc 50 50 -text "*MYBARCODESTRING*" -font "{3 of 9} 12"

BarCode DataBase
[http://sourceforge.net/projects/bcdb]
is coded in [Perl].


[GNU] Barcode
[http://ar.linux.it/software/#barcode]
is a command-line executable.

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[Harald Oehlmann] and [kroc] are in the barcode business.
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[RS] played with [Code 39 generation]

And [PS] did the same for [EAN-13 generation]


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There are "barcode printers" which accept textual Zebra Programming Language (ZPL).
Tcl is as good at generating ZPL as any likely competitor.

"Barcode Writer in Pure [Postscript]"
[http://www.terryburton.co.uk/barcodewriter/] generates all major one-dimensional symbologies and is open source.
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[Silas] - 2005.08.18 - I did a little script to figure out the checksum digit of EAN-13 barcodes. See [EAN-13 checksum].
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[Category Barcode]