System Monitoring Center – System Performance and Usage Monitoring Tool
System Monitoring Center is a free and open source system monitoring application for Linux, MacOS and Windows. It is released under GNU General Public License v3.0 and written in Python. Using this tool you can view your system performance details and usage details like CPU, RAM, Disk, Network, GPU, Sensor hardware, uses, startup, and more. You can also customize the options per tab basis. This is still in beta stage and active development.