TerraformGenerator is a world generator plugin that aims to provide an enhanced vanilla feel. As of now, it is in an Alpha stage, meaning some core features are subject to change (a list of known issues and to-dos is on the discord). However, the world is playable with all vanilla items obtainable, though I will heavily recommend thoroughly testing it for yourself before deploying it to a production environment
There are commands, but they are developer commands and only available via /op. Try not to use them unless you understand what they do.
Links to wiki, with most of the plugin's biomes and structures as images: