Zoi is a server backend written in Zig that relies only on the standard library. Zoi is not a library but instead is essentially a template for you to use to create your own server in Zig.
Zoi is a backend that is coded in Zig and configured in json (previously in toml). It features a custom callback based router with support for parameters and limited support for wildcards. It contains functionality for serving static files and a very rudimental templating system.
You should make changes to src/main.zig and src/routes.zig to set up your routes and logic; then run zig build run. Zoi is built for Zig 0.15.
Thanatos is an example of using Zoi as an alternative to something like Tauri or Electron.