Anchor has a neat product. They're making internal TLS more accessible to more developers who don't necessarily need a separate web server. They're doing local TLS just about as best as possible from what I can see.
IMO this has more utility than mkcert -- which is a great tool by Filippo and Caddy shares some of its underlying library for its own auto-trusted internal CA -- because, like Caddy, Anchor fully automates the certificates instead of just generating them and needing a cron job. It's more hands-off and higher-level, allowing you to get more done with less effort.