Markdown vs Asciidoctor: What are the differences?
Markdown: Text-to-HTML conversion tool/syntax for web writers, by John Gruber. Markdown is two things: (1) a plain text formatting syntax; and (2) a software tool, written in Perl, that converts the plain text formatting to HTML; Asciidoctor: An open source, pure Ruby processor for converting AsciiDoc documents or strings into HTML and other formats. It is a fast, open source text processor and publishing toolchain for converting AsciiDoc content to HTML5, DocBook, PDF, and other formats. Asciidoctor is written in Ruby and runs on all major operating systems .
Markdown and Asciidoctor are primarily classified as "Languages" and "Text Processors" tools respectively.