A full featured Tk-based knot and link editor
PLink is a full featured graphical editor for knot and link projections, using the cross-platform GUI toolkit Tk. The primary focus is on piecewise-linear link projections, but it also supports a “smooth mode” and can export images in PostScript, PDF, SVG, and TikZ formats. See the PLink home page for complete details.
You can browse the source code here.
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