My most popular Ruby gem, markdown_helper (closing in on 8,000 downloads) has the drawback that a potential user must have Ruby installed.
For man...
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I would assume Rust, probably. A number of Ruby users, like Sean Griffin and Steve Klabnik, love it. It has an existing, good implementation of CommonMark. And it produces executables that only link to the DLL's that ship with Windows. There's even a tool to integrate WiX with Cargo to produce Windows Installers!
Thanks, Michael.