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Open

• gLabels
• kbarcode
• LabelNation - command line only

Online

• Warning Label Generator - exactly what is says!
• Avery Design & Print Online

Shareware/Freeware

• Worldlabel Pro Wizard Designer

Commerical

• BeLight Software's Labels & Addresses - Mac, $50

Developer Tools

I can't vouch for anything listed here (you can see what I use on the credits page).

• Perl: PostScript::MailLabels