Multi-site CMS
Each site is a normal public website:
/{slug}, with the page slug home serving the front page./blog and posts at /{slug}, on sites with the blog on. A site with no home page but with posts shows the post list at its root./tag/{tag} and month archives at /{year}/{month}./search?q=…, which looks across published posts./feed.xml, an XML sitemap and a robots.txt.