SYSTEM_TOOLS

DESC: Parametric calendar generator in the International Typographic Style — strict grid, flush-left sans-serif, hairline rules, one accent ink. Four views (Year / Month / Week / Day), a selectable columns × rows grid for the Year view (4×3, 3×4, 6×2, 2×6, or long 12×1 / 1×12 strips), ES/EN content, per-country national holidays with computed movable feasts, editable title and per-date notes. Live preview, SVG export with named layers plus PNG. Web counterpart of the Affinity (by Canva) script, same drawing engine.

DESC: Parametric grid generator for structural layout design. Six iconic presets based on Müller-Brockmann, Gerstner, Vignelli and Tschichold. Harmonic Mode locks margin, gutter and baseline to a master ratio (Phi, √2, and more). Exports SVG with named layers for Illustrator, Affinity and Inkscape.

DESC: Browser-based hidden-line removal for plotter SVGs. Strips geometry hidden by layered fills (Cavalry and similar generative rigs export every iteration stacked) so a pen plotter only draws what's actually visible. SVG and DXF export, fully offline.

DESC: Volumetric pentomino solver rendered in real-time WebGL. Classic 6×10 fill mode (2339 unique solutions, symmetry-aware) plus 20 progressive shape-matching levels. Includes a level editor with solver-based validation, shareable challenge codes, no-backend result sharing, 6 visual themes (holographic / ASCII / blueprint / synthwave / hand-drawn sketch, light & dark) and full ES/EN support. Installable offline-first PWA.