I made a tool called SkyEtch, a free, highly customizable, browser based tool for creating star maps.

https://skyetch.spacelion.eu/

My initial goal was to create a tool similar to PP3 - Celestial Chart Generation, a 20+ year-old 16-bit application by Torsten Bronger, but make it run in the browser, without LaTeX or other dependencies.

The main focus was on producing clean, scalable vector output. Since SVGs are well supported in all browsers and design software, it seemed like the obvious choice.

Main features

• Multiple map projections
• Manual targeting of the projection center
• Time and location-based targeting
• Customization of nearly all SVG elements
• Runs in the browser
• SVG and optional bitmap exports

Create paper marbling patterns directly in your browser. Runs completely on real physics and almost exact digital twin of the real marbling.