Because HTMX is totally unopinionated regarding the backend, and also expects pure HTML responses, you have a ton of freedom.
In most cases, this means your choice of backend framework in virtually any language, anything from Django to RoR to Spring to http4k to Laravel, plus some templating framework/language such as Handlebars, Jinja, Thymeleaf, Moustache, JTE, etc.
In most cases, this means your choice of backend framework in virtually any language, anything from Django to RoR to Spring to http4k to Laravel, plus some templating framework/language such as Handlebars, Jinja, Thymeleaf, Moustache, JTE, etc.