Deno — A modern runtime for JavaScript and TypeScript
Source-code: https://github.com/denoland/deno
Ghostscript
Ghostscript is the #1 PDL conversion and interpreter tool available, offering native rendering of PDF, PostScript, PCL, XPS, raster and vector files, as well as ASCII text.
Markdown Guide
A free and open-source reference guide that explains how to use Markdown.