BARCODE TO PC ON GNU/LINUX
Easy setup, both on the iPhone and on a Debian Gnu/Linux server. I use it with Tellico, a cataloging program. Give a window and a widget on that window the focus (by clicking on it with the mouse), and the server drops the decoded barcode right in as though one had typed it.
The only criticism I have is that the setup instructions are a bit confusing. They should be numbered instructions: do this, do that, do the other. Not everyone has 25 years experience with Gnu/Linux.

What is Barcode to PC?
Barcode to PC turns your smartphone into a wireless barcode scanner that works instantly with your computer. Perfect for inventory, asset tracking, or point-of-sale systems—no cables, no complicated setup. Just scan and the data appears on your PC like magic. Fast, simple, and works out of the box.
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