Punchcard Overview
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Design your Own Stitch Patterns
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Online Punchcard Creator

Here is an open source program that creates simple punchcard designs from your images.

oknitme
You can upload a 2 color image and it translates your drawing to punchcard format. The project creates a file that is designed to be used with laser printers. (The output is in SVG – scalable vector graphic format). But it can also be used to manually create punchcards.