Calc sheet and guide to design knitting charts.
The cells of the sheet have the good proportions for knitting charts (stranded work, intarsia): the pattern is given by filling the cells with the colours. We can use a picture as a model or directly draw the pattern on the sheet. Nothing automatic, but it is the best way that I found to make knitting charts.
A detailed guide explains how to make the chart in French, English and Spanish.