Apps similar to Trusted End Node Security include Tails, which is free and open source. Other options are EndeavourOS, Qubes OS, Whonix and Windows 11. There's no shortage of Operating Systems like Trusted End Node Security, with more than 25 alternatives for Linux, self-hosting, Windows, Mac and the web.
BunsenLabs Linux is a distribution offering a light-weight and easily customizable Openbox desktop. The current release is Helium, built on top of Debian (stable). The project is a community continuation of CrunchBang Linux.
MINIX is a POSIX-compliant Unix-like operating system based on a tiny microkernel running in kernel mode with the rest of the operating system running as a number of isolated, protected, processes in user mode.
Netherlands
EU
Regolith Linux is a distro for people that prefer a spartan interface with polished and consistent system management. It brings together a trifecta of Ubuntu’s ubiquity, i3 -wm’s efficient and productive interface, and Gnome’s system...
United States
Kodachi is a Debian-based distro which can be run from a DVD or USB thumb drive. It filters network traffic via a VPN and Tor, obscuring the user's location. It attempts to clean up after itself, removing traces of its use from the computer.
Oman
The unofficial successor of Antergos, RebornOS is an Arch-based distro that focuses on allowing the user to decide exactly how they want their system while making it easy for anyone to do so - both during installation and afterwards.
Serenity is a graphical 32-bit Unix-like operating system with 90s aesthetics and built for x86 systems.
SwedenEU
A Fast, friendly, open-source operating system, for newbies, geeks & DIY enthusiasts.
India
General purposed Web Desktop Operating Platform / OS for Raspberry Pis, Now written in Go! - tobychui/arozos
An operating system designed with latest features and security for everyone who want to unleash their potential.
The ubermix is an all-free, specially built, Linux-based operating system designed from the ground up with the needs of education in mind.
United States
The CLIP OS project is an open source project maintained by the ANSSI (National Cybersecurity Agency of France) that aims to build a secure, multi-level operating system, based on the Linux kernel and a lot of free and open source software.
France