Hugo is a blazing fast static site generator written in Go with flexible templating. It handles go-powered, fast builds, themes, and multilingual, and it's best suited for developers wanting the fastest static site generator. It has been around since 2013, giving it a 13-year head start in building out integrations and refining the product.

The core product is entirely free. Since it's open-source, you can self-host for free with no user limits. It's aimed at individual users, so it's fast to set up but may lack team-management features if you scale.