Each of these modes is effectively an in-emacs application.
blog-minimal is built on org-mode and well integrated into Emacs.
Being based on Pandoc, Hakyll has built-in support for org-mode files. The only limitation is the absence of support for org-mode metadata (#+TITLE, etc): Hakyll still requires a Jekyll-like YAML metadata block.
Jekyll is a static website and blog engine. It's possible to write everything in org-mode in a single org file, as described in this blog post: http://endlessparentheses.com/how-i-blog-one-year-of-posts-in-a-single-org-file.html
Technically, it's needed to use his package ox-jekyll-subtree and then we just need to call M-x endless/export-to-blog to export the current org subtree as a jekyll entry post.
org_reader is a Pelican plugin to write posts in org-mode.
Nikola can handle org-mode files with the extension org2nikola.
Hublo uses elisp to write configuration and the phases of build.
See more options within the Blog category.