What are blog systems for embedding in your site?

Question

Blogs

We want to organize a blog on the site, but I don’t want to cut my bike. Maybe there is something ready-made for embedding on the site? Maybe some services.
Of course, the option comes to mind to put wordpress separately and blog part of it, but for now this is as a fallback option, since for me WP is somewhat "large" for blogging only.
Of the desired functions - a convenient content editor, with drag & drop, some templates, perhaps various integrations with email, social networks.