Monitoring

GreenWithEnvy is a utility for getting information, controlling fans, and overclocking an NVIDIA graphics card. Free and open source program

Mission Center – Monitoring CPU, disk, network, and GPU usage. A free and open source program

GtkStressTesting is a GTK utility designed to stress and monitor various hardware components such as processor and RAM. A free and open source graphics program

System Monitoring Center – monitoring system performance and usage. Free and open source program

Mini System Monitor – monitoring of CPU usage, RAM, disk, network. Free and open source program

CPU-X is a free and open source software for collecting information about the processor, motherboard and much more

KDiskMark is a free and open source simple tool for benchmark HDD and SSD with a user-friendly graphical interface for Linux

Psensor – free and open source graphical utility for temperature monitoring in Linux

Nutty is a free and open source network utility that tracks devices on your network and checks data on bandwidth and speed