List of the Top 3 Free OT Secure Remote Access Software in 2025

A reliable, swift, and secure solution for remote access enables users to connect efficiently to devices and servers, facilitating quicker problem resolution. This technology enhances productivity by allowing immediate intervention from virtually anywhere.

The Tosi Platform presents a groundbreaking solution for Cyber-Physical Systems, specifically designed to protect, connect, and oversee Operational Technology (OT) networks along with critical infrastructure. Unlike traditional IT tools that have been adapted for use in OT environments, Tosi is purposefully engineered for industrial applications, ensuring compatibility with native industrial protocols and resilience to extreme temperature fluctuations, all while simplifying setup processes. Its deployment is remarkably rapid, enabling operational readiness in under five minutes through an easy “plug-and-go” method, allowing organizations to securely and effectively link their distributed systems without requiring advanced IT expertise. The platform is fortified with a strong zero-trust security model that encompasses enterprise-grade protections, including end-to-end 256-bit AES encryption, hardware-based authentication utilizing RSA keys, the elimination of open inbound ports, and adherence to ISO/IEC 27001:2022 standards. Furthermore, Tosi enhances the user experience with TosiControl, a unified management interface that visualizes network topology for improved oversight and control, ultimately boosting both operational efficiency and security throughout the organization. This all-encompassing design not only simplifies management tasks but also significantly fortifies the security framework within industrial settings, making Tosi an essential asset for modern enterprises.

BlastShield is an advanced zero-trust, software-defined perimeter solution designed specifically to protect critical IT and OT assets by rendering them invisible and unreachable to unauthorized users. By establishing a secure, encrypted peer-to-peer overlay network, it adeptly shields sensitive data and protected devices from detection by network scanning and traffic analysis tools, thereby preventing issues like credential theft, reconnaissance attempts, and unauthorized lateral movements. This innovative solution incorporates phishing-resistant, passwordless multi-factor authentication techniques, including mobile authenticators and FIDO2 keys, alongside microsegmentation, data encryption in transit, and access controls governed by policies, ensuring that only devices and users with explicit authorization can connect. Additionally, BlastShield boasts the flexibility to be implemented across diverse network environments, such as TCP/IP, SCADA, SD-WAN, or even raw Ethernet, allowing it to secure a wide array of assets, including legacy OT/ICS devices, sensors, PLCs, HMIs, cloud virtual machines, and virtual infrastructures. Its comprehensive security architecture not only boosts protection levels but also enhances operational efficiency across varying technological ecosystems, making it a formidable choice for organizations seeking robust cybersecurity solutions. The adaptability of BlastShield positions it as a valuable asset in the ever-evolving landscape of digital security.