It is a Stack of 4 frameworks for web dev namel --
1) Tailwind CSS
2) Alpine JS
3) Laravel
4) Laravel - LiveWire

Tall Stack says = "
A new way to build rich, reactive web apps.

Learn Laravel, style it easily with Tailwind, and write Laravel-like Livewire components and a dash of Alpine.js, and you've got a full-stack reactive and interactive platform for creation.
"

Its Website = "https://tallstack.dev/"