There are many tools and software programs that can be used for monitoring and performance analysis on Linux systems. Some popular options include:

• top - This is a command-line utility that shows real-time information about the processes running on a Linux system, such as their CPU and memory usage.
• htop - This is a more advanced version of top that provides a more user-friendly interface and additional features, such as the ability to sort processes by different metrics and to kill processes.
• sar - This is a command-line utility that collects and displays performance metrics for a Linux system over time. It can be used to analyze CPU, memory, I/O, and network usage, as well as other metrics.
• iostat - This is a command-line utility that shows real-time information about I/O performance on a Linux system. It can be used to monitor the performance of disks and other storage devices.
• vmstat - This is a command-line utility that shows real-time information about various system resources, such as memory, CPU, and I/O. It can be used to monitor the overall health of a Linux system.
• netstat - This is a command-line utility that shows information about network connections on a Linux system. It can be used to monitor the status of network connections and to diagnose networking issues.

There are also many modern monitoring tools and software programs available for Linux, such as Prometheus and Zabbix. These tools typically offer more advanced features and capabilities than the built-in Linux utilities, such as the ability to collect and store metrics over time, and to generate alerts when certain conditions are met.