add multiple

Author: beardicus

README.md

@@ -61,6 +61,7 @@ Pen plotters available to build or purchase, historical information, and restora
 - [NextDraw](https://store.bantamtools.com/collections/bantam-tools-nextdraw) - The [Bantam Tools](https://www.bantamtools.com) successor to the popular AxiDraw pen plotter.
 - [openBrushograph](https://github.com/openBrushograph/openBrushograph_hardware) - Open source 3d-printable XY gantry and Z-stage designed for automated brush and pen painting.
 - [Lego-Pen-Plotter](https://github.com/Jormono1/Lego-Pen-Plotter) - Pen plotter built entirely of LEGO and programmed with PyBricks and Python.
+- [Makelangelo 5](https://www.marginallyclever.com/products/makelangelo-5/) - Polargraph robot that draws on a wall, window, or easel.
 - [Reviving the Apple 410 Color Plotter](https://www.nycresistor.com/2017/12/13/reviving-the-apple-410-color-plotter/)
 - [Apple-410](https://github.com/phooky/Apple-410) - Apple 410 Color Plotter documentation, drivers, and ROM dumps.
 
@@ -149,6 +150,8 @@ Software for controlling plotter hardware.
 - [saxi](https://github.com/nornagon/saxi) - Driver and library for the AxiDraw. Uses constant-acceleration motion planning and automatically resizes to paper.
 - [MP2300-Tools](https://github.com/Jan--Henrik/MP2300-Tools) - Software for converting HPGL to Graphtec's GPGL format, as well as CAD files for a Graphtec plotter pen adapter.
 - [Inkcut](https://github.com/inkcut/inkcut) - Application for controlling 2D plotters, cutters, engravers, and CNC machines.
+- [plottie](https://github.com/mossblaser/plottie) - Command-line tool for controlling Silhouette plotters and cutters with SVG input.
+- [py_silhouette](https://github.com/mossblaser/py_silhouette) - Python library for controlling Silhouette plotters and cutters.
 - [pypenwriter](https://github.com/Lana-chan/pypenwriter) - Python script to convert and send SVG drawings to the Panasonic PenWriter family of typewriter plotters.
 
 ### Vector Creation
@@ -197,6 +200,7 @@ Tools to create vector artwork from scratch or by conversion from other formats.
 Tools to manipulate and optimize vector-based file formats.
 
 - [svgsort](https://github.com/inconvergent/svgsort) - Path planning for plotting SVG files, reduces time spent moving with the pen up.
+- [svgoutline](https://github.com/mossblaser/svgoutline) - Python library to extract strokes and outlines from SVGs as line segments.
 - [svgo](https://github.com/svg/svgo) - Node.js-based tool for optimizing SVG files.
 - [Polargraph Optimizer](https://github.com/ezheidtmann/polargraph-optimizer) - Optimize drawing plan for a polargraph.
 - [penkit-optimize](https://github.com/paulgb/penkit/tree/master/optimizer) - An SVG optimizer that uses a vehicle routing solver to minimize plot time.