Nanoc fills this niche quite well. It's more of a SSG toolkit than an SSG.
You build a Rules file with steps for each of your file types and it loops through and builds your site. It comes with Markdown out of the box but you can make it do just about anything.
You build a Rules file with steps for each of your file types and it loops through and builds your site. It comes with Markdown out of the box but you can make it do just about anything.
https://nanoc.app/