Does Backdrop have some functionality similar to Domain Access module?

Do any other CMS have an equivalent of Drupal's Domain Access module?

It is a module which enables content from a single-site to be placed under different domain names, with reading and writing permissions all controlled by the user permissions system.

There is something else I have to add - Domain Access runs on the same database and the same table name prefix and the same directory. The different domains don't run on different sub-directories and databases and table prefixes

Overview

The Domain Access project is a suite of modules that provide tools for running a group of affiliated sites from one Drupal installation and a single shared database. The module allows you to share users, content, and configurations across a group of sites such as:

example.com
one.example.com
two.example.com
my.example.com
thisexample.com <-- can use any domain string
example.com:3000 <-- treats non-standard ports as unique

By default, these sites share all tables in your Drupal installation.