Kulfon [1] is a static site generator that compiles Org Mode to HTML without using Emacs. You can just drop `.org` files in a directory and run a one-command tool to make this work. I use it for my website, mostly to write blog posts. It is also possible to mix Markdown and Org Mode files in a single project/directory.
Kulfon is my own project, so take it with a grain of salt. I've decided to focus on Org Mode as I also believe this format doesn't get the recognition it deserves. It doesn't mean Markdown is bad, au contraire, it is almost perfect. In Org Mode, for instance, I still cannot get used to the source code blocks. It is, however, good to have a choice.
The Org Mode support in Kulfon is not perfect yet, but good enough for most situations. It is based on a JavaScript plugin by Xiaoxing Hu called orgajs [2]. You can use it directly in your project.
One of the motivations for building a SSG with Org Mode was Org Brain [3]. I have a plenty of interconnected notes that I would like to publish on my website « as-is ». This would be rather difficult to do using Markdown format.
[1]: https://kulfon.org/
[2]: https://github.com/xiaoxinghu/orgajs
[3]: https://github.com/Kungsgeten/org-brain