For this calendar, I designed 24 knitting charts on the theme of free software that you will discover during the 24 days before Christmas, and a bonus.

I knitted some, other not or still not.

If all the charts are in public domain, it is not the case of the logos. It is to you to verify if and how you can use them.

Their are just fan-art, nothing official or affiliated to the various organizations or softwares of which the charts refer.

You even can design your own charts on this base using the spreadsheet linked to this rubric, or the template that also gives all the instructions to make any chart on any size you want.