vtop takes more of a graphical approach to top, while concentrating more on simplicity. It displays CPU and Memory usage live charts, as well as a running process list. It runs on Node.js and can be easily installed with npm install -g vtop.
Features: - Mouse clicks - Themes - Live chart (CPU, memory) - Process list
gtop takes the graphical interface of vtop to another level. Just like vtop, it also displays a live chart of both CPU and memory, however gtop adds a network live chart to the list, and pie charts for both memory and swap, as well as storage usage.
gtop also runs on Node.js, and can easily be installed with npm install gtop -g.
Features: - Live chart (CPU, memory/swap, network) - Pie chart (memory, swap, disk usage) - Process list
While s-tui is not a process monitoring utility, it displays great information about your process status. It's python based and uses little resource. You can easily install it with sudo pip install s-tui.
Features: - Processor info - Live charts (CPU freq, utilization, temperature and power usage) - Built-in CPU stress testing