Vector Design 2D: Spiro Curves
Suggested by Maxi from Producción Gráfica
Inkscape now features Spiro curves (Cornu spirals) introduced to design world by Raph Levien. While FontForge is the first (open source) project that has implementation of Spiro, Inkscape provides a number of features unmatched by other tools, as demonstrated by Andy Fitzsimon. Spiro curves are implemented as a live path effect and can be applied to any existing Bezier path of be drawn from scratch with either Pen or Pencil tool.
Original idea, design & development @ceslava