Best Subgraph Citadel / Subgraph OS Alternatives & Competitors in 2026

Cyber Resilience for Embedded Systems

Embedded system security solutions for Linux-based mission-critical systems

Scylos ZeroCore / Switchboard

Ephemeral, stateless endpoint container substrate for edge compute via cloud mgmt.

Sandboxie Plus

Open-source sandbox isolation software for running untrusted apps on Windows.

Firejail

Firejail is a Linux sandbox program that isolates untrusted applications using kernel namespaces, seccomp-bpf, and capabilities to reduce security breach risks.

odix TrueCDR™ Kiosk

Secure kiosk for sanitizing USB & uploaded files using CDR technology

zeroRISC Integrity Management Platform

Device trust mgmt platform using OpenTitan secure silicon for IoT/edge/DC

RTS Secure Boot Loader

Secure bootloader for EFI Secure Boot with digital signature verification

Star Lab Titanium Security Suite

Linux system hardening suite with mandatory access control and anti-tamper

Kevlar Embedded Security

System hardening solution for embedded Linux devices

Star Lab Titanium Secure Boot

Boot-time authentication solution for Linux systems using measured boot

Titanium for Linux

Linux system hardening platform with MAC, encryption, and runtime protection

Invary for CIS

Runtime integrity solution for OS, hardware, and software via CIS partnership.

BusKill App

A cross-platform security application that functions as a laptop kill cord, automatically locking or shutting down your computer when physically separated from you via a USB connection.

Vali Cyber ZeroLock

Linux security platform for federal/national security environments

NinjaOne Autonomous Patch Management

Automated patch management for Windows, macOS, Linux, and applications

ESET Server Security

Server security solution protecting file servers, SharePoint, and Linux systems

Bitdefender GravityZone Security for Workstations

Endpoint protection for workstations with layered defense against malware

Xcitium ZeroDwell

Real-time virtualization tech that contains unknown executables in containers

Accops HyDesk

Energy-efficient thin client devices for centralized VDI computing

Remedio Smart Device Hardening

Automated device hardening and configuration management platform

Action1 Patch Management

Cloud-native patch management for Windows, macOS, and Linux endpoints

Action1 Windows Patch Management

Cloud-based patch management for Windows, macOS, and Linux endpoints

Automox Security Platform

Cloud-based endpoint mgmt platform for patching, config, & software deployment

Virsec OTTOGUARD.AI

Autonomous workload protection platform with patchless vulnerability mitigation

Monarx

Web hosting security platform for threat detection, removal, and protection

Monarx Server Protection

Server-level malware detection and remediation for Linux servers and VPS

Monarx Threat Detection

Behavior-based AI malware detection for Linux servers and containers

Monarx Platform

Server-based malware detection and removal platform for web hosting

Codenotary Guardian

AI-powered Linux system protection with auto-remediation and compliance

Senteon Zero Trust Configurations

Automates endpoint hardening & compliance with CIS & regulatory benchmarks

Nyx Software Security Solutions

Embedded systems security for IoT devices and operating systems

Internxt Antivirus

Antivirus software for malware detection and removal on Windows, Mac, and Linux

Atomicorp Atomic OSSEC

Centralized AV/antimalware XDR platform for server & cloud workloads.

BitNinja

AI-powered real-time malware detection and removal for Linux servers.

Blue Ridge Networks AppGuard

Zero Trust endpoint & server breach prevention via app isolation/containment.

KAZUAR Secured Workspace

Hardware-separated dual-workspace laptop for protecting sensitive org data.

North Pole Security Workshop

macOS EPP platform using Santa for binary allowlisting & endpoint control.

VISSBOX

The Condom for your PC - shielding Endpoints from remote code execution and attacks

OnSystem Logic OnSystem Defender

Endpoint app control & memory protection to prevent malware execution on Windows.

Lyrie AI Security & Privacy Anti-Malware & Anti-AI

Multi-layered EPP/EDR for desktop & mobile with Anti-AI threat defense.

Comodo Advanced Endpoint Protection

Endpoint protection platform using zero trust architecture and containment

Armor Defense Armor Agent

Free host security agent for Windows/Linux with malware, IDS/IPS, FIM & vuln scanning.

ClamAV

ClamAV is an open-source antivirus engine that detects trojans, viruses, malware, and other malicious threats.

usbutils

A collection of utilities for working with USB devices on Linux

Silk Guardian

An anti-forensic Linux Kernel Module kill-switch for USB ports.

USB Keystroke Injection Protection

A daemon for blocking USB keystroke injection devices on Linux systems

AppLocker Guidance

A repository containing scripts and configuration files to help administrators implement Microsoft AppLocker for application whitelisting based on NSA security guidelines.

Shellclear

A command-line tool that secures shell command history by clearing sensitive commands, displaying command summaries, and providing stash functionality for presentations across multiple shell environments.