While I haven't officially launched https://lmno.lol blogging platform and not exactly monospaced, it shares much of the site's simplicity. You can view my blog at https://lmno.lol/alvaro (powered by a single markdown file). You can already play with the platform without signing in, but if you're keen to start blogging today, ping help\at\lmno.lol and I'll share an invite code.
