Chromium OS Universal Chroot Environment.

crouton is a set of scripts that bundle up into an easy-to-use, Chromium OS-centric chroot generator. Currently Ubuntu and Debian are supported (using debootstrap behind the scenes), but "Chromium OS Debian, Ubuntu, and Probably Other Distros Eventually Chroot Environment" doesn't acronymize as well (crodupodece is admittedly pretty fun to say, though).

standalone SSH server that connects you to your Docker containers.

ssh2docker is a SSH server that can create new Docker containers and/or
join existing ones, with session, and dynamic configuration support.
It is an alternative to chroot.

Easily manage Linux Chroot(s) and Containers with Atoms.
Atoms was created to solve the lack of a GUI to create, manage and use chroot environments. Although there is support for Distrobox, Atoms does not aim to offer a fine integration with Podman as its purpose is only to allow the user to open a shell in a new environment, be it chroot or container.

Jailkit is a set of utilities to limit user accounts to specific files using chroot() and or specific commands. Setting up a chroot shell, a shell limited to some specific command, or a daemon inside a chroot jail is a lot easier and can be automated using these utilities.

LXC is the userspace control package for Linux Containers, a lightweight virtual system mechanism sometimes described as “chroot on steroids”.