Looking into hastl, which is a modern Haskell web application template using (H)tmx, (A)lpine.js, (S)ervant, (T)ailwind-css and (L)ucid. It is licensed under MIT and is entirely free and open source.

Features: Type-safe APIs, Modern frontend with htmx, Live reloading with GHCID. On GitHub: eldr-io/hastl.

Haskell development environment

Under NixOS I use a Docker image, which is described in this post: Haskell tooling in a docker container