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I am a big fan of Statamic CMS. 
 A bit similar to Grav, but better in my opinion. Based on Laravel (i.e. PHP), can be used with or without a database (flatfile first), headless/JAMstack or classic, suitable for small or very large sites, great maintenance backend for editors, well documented, easy to update ...
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Publii looks interesting. For the people that use Publii, are there more themes than what's available on their own Marketplace? @threetrees3 all available themes are displayed on their website. But they are very easy to customize to your needs. 
 
