One a did earlier this summer

I've seen some posts here discussing vector halftone effects for use in stencils, and some have mentioned my app Vectoraster for creating those. Vectoraster is unfortunately macOS exclusive. However, I'm now working on a new vector graphic tool I'm calling Paragraphic that is cross-platform (mac, windows and linux), so I figured you might be interested in that if you're interested in halftones and vector gradient/pattern effects.

While not as specialized in halftones as Vectoraster you can make some pretty nice custom halftone effects in Paragraphic as well, as shown in this video, and you can do a lot more with the patterns and output compared to Vectoraster. Output is SVG vectors for cutting or plotting for example, though based on the complexity I probably wouldn't recommend trying to cut out all the halftone shapes by hand.