There are a growing number of frontends, including the following:

• Scribus - is a WYSIWYG desktop publishing (DTP) application for Linux and Windows users. http://www.scribus.net/ 

From the Linux Format issue 80 article "Open source desktop publishing turns pro":

 

In many ways, Scribus is the runaway success story of open source graphics. Yes, Gimp is great, Inkscape has potential - but Scribus set itself the challenge of coming from nowhere to being a solid, professional DTP solution, and by traditional standards of software development, it's done that in next to no time.

In fact, the latest release of Scribus (1.3.3) offers features not available as standard in professional DTP software, such as the ability to generate barcodes completely within the software. It would be unthinkable for a commercial DTP product to come from zero lines of code to a reliable, professional tool in five years. 

• KBarcode - is a WYSIWYG barcode and label printing application for Linux and KDE 3. http://www.kbarcode.net
• pst-barcode - is part of the PSTricks package for the LaTeX document publishing system. http://www.ctan.org/tex-archive/graphics/pstricks/contrib/pst-barcode/
• Web-based generator - useful for feature testing or generating a small number of barcodes. http://www.terryburton.co.uk/barcodewriter/generator/