Sternum is described as 'seamlessly embeds security into your embedded devices. With a new approach to IoT security, Sternum has built a holistic, highly scalable IoT endpoint security solution, that prevents attacks in real-time and provides on-going visibility and monitoring into the device'. There are six alternatives to Sternum, not only websites but also apps for a variety of platforms, including Mac, Linux, Windows, BSD and iPad. The best alternative is htop, which is both free and Open Source. Other great sites and apps similar to Sternum are Glances (Free, Open Source), Resource Monitor (Free), Iotop (Free, Open Source) and Atop (Free, Open Source).
Glances is a cross-platform monitoring tool which aims to present a large amount of monitoring information through a curses or Web based interface. The information dynamically adapts depending on the size of the user interface.
Resource Monitor is a system application in Microsoft Windows operating systems. It is used to view information about the use of hardware (CPU, memory, disk, and network) and software (file handles and modules) resources in real time.