If you have mostly static web sites with little work to update, you could try out the flat-file KirbyCMS: https://getkirby.com/ - it is a CMS I tried myself and liked quite much.
I want to point out that it is not an open-source project like Wordpress, but a one-time licence fee you have to pay once you go live with your project.
There is a great community around KirbyCMS who are building plugins for it, for example the SEO tool you want, in this case it is free / "pay what you want" pricing model, so it should be quite affordable: https://plugins.getkirby.com/tobimori/seo
Try Screaming Frog, Ahrefs, or SurferSEO for analysis and recommendations. For static sites, Netlify CMS or Ghost offer built-in SEO tools. It may take time for your team to adapt, but these tools cover most Yoast-like needs."
You could try my Chrome extension that will crawl pages on a site looking for SEO problems like missing titles/headings/descriptions, duplicate pages/titles/headings/descriptions and broken links:
If you have mostly static web sites with little work to update, you could try out the flat-file KirbyCMS: https://getkirby.com/ - it is a CMS I tried myself and liked quite much.
I want to point out that it is not an open-source project like Wordpress, but a one-time licence fee you have to pay once you go live with your project.
There is a great community around KirbyCMS who are building plugins for it, for example the SEO tool you want, in this case it is free / "pay what you want" pricing model, so it should be quite affordable: https://plugins.getkirby.com/tobimori/seo
edit: also this could be of interest, as it has the intention of helping to do SEO checks when migrating from WordPress to Kirby - https://plugins.getkirby.com/johannschopplich/seo-audit
Try Screaming Frog, Ahrefs, or SurferSEO for analysis and recommendations. For static sites, Netlify CMS or Ghost offer built-in SEO tools. It may take time for your team to adapt, but these tools cover most Yoast-like needs."
You could try my Chrome extension that will crawl pages on a site looking for SEO problems like missing titles/headings/descriptions, duplicate pages/titles/headings/descriptions and broken links:
https://www.checkbot.io/
It's a general web crawler so it'll work on WordPress sites and static sites, and only requires you to install the extension to get going.
Great question, I’m also looking for the same. Lmk if you find any alternatives!
https://gohugo.io/ is pretty good. Here's a discussion about migrating website from WordPress to Hugo. https://news.ycombinator.com/item?id=41377331
Hugo has no SEO capabilities (in the sense OP is thinking about). You‘d have to implement them yourself in the templates and front matter.